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"""BigQuery sources and sinks.
This module implements reading from and writing to BigQuery tables. It relies
on several classes exposed by the BigQuery API: TableSchema, TableFieldSchema,
TableRow, and TableCell. The default mode is to return table rows read from a
BigQuery source as dictionaries. Similarly a Write transform to a BigQuerySink
accepts PCollections of dictionaries. This is done for more convenient
programming. If desired, the native TableRow objects can be used throughout to
represent rows (use an instance of TableRowJsonCoder as a coder argument when
creating the sources or sinks respectively).
Also, for programming convenience, instances of TableReference and TableSchema
have a string representation that can be used for the corresponding arguments:
- TableReference can be a PROJECT:DATASET.TABLE or DATASET.TABLE string.
- TableSchema can be a NAME:TYPE{,NAME:TYPE}* string
(e.g. 'month:STRING,event_count:INTEGER').
The syntax supported is described here:
https://cloud.google.com/bigquery/bq-command-line-tool-quickstart
BigQuery sources can be used as main inputs or side inputs. A main input
(common case) is expected to be massive and will be split into manageable chunks
and processed in parallel. Side inputs are expected to be small and will be read
completely every time a ParDo DoFn gets executed. In the example below the
lambda function implementing the DoFn for the Map transform will get on each
call *one* row of the main table and *all* rows of the side table. The runner
may use some caching techniques to share the side inputs between calls in order
to avoid excessive reading:::
main_table = pipeline | 'VeryBig' >> beam.io.ReadFromBigQuery(...)
side_table = pipeline | 'NotBig' >> beam.io.ReadFromBigQuery(...)
results = (
main_table
| 'ProcessData' >> beam.Map(
lambda element, side_input: ..., AsList(side_table)))
There is no difference in how main and side inputs are read. What makes the
side_table a 'side input' is the AsList wrapper used when passing the table
as a parameter to the Map transform. AsList signals to the execution framework
that its input should be made available whole.
The main and side inputs are implemented differently. Reading a BigQuery table
as main input entails exporting the table to a set of GCS files (in AVRO or in
JSON format) and then processing those files.
Users may provide a query to read from rather than reading all of a BigQuery
table. If specified, the result obtained by executing the specified query will
be used as the data of the input transform.::
query_results = pipeline | beam.io.gcp.bigquery.ReadFromBigQuery(
query='SELECT year, mean_temp FROM samples.weather_stations')
When creating a BigQuery input transform, users should provide either a query
or a table. Pipeline construction will fail with a validation error if neither
or both are specified.
When reading via `ReadFromBigQuery` using `EXPORT`,
bytes are returned decoded as bytes.
This is due to the fact that ReadFromBigQuery uses Avro exports by default.
When reading from BigQuery using `apache_beam.io.BigQuerySource`, bytes are
returned as base64-encoded bytes. To get base64-encoded bytes using
`ReadFromBigQuery`, you can use the flag `use_json_exports` to export
data as JSON, and receive base64-encoded bytes.
ReadAllFromBigQuery
-------------------
Beam 2.27.0 introduces a new transform called `ReadAllFromBigQuery` which
allows you to define table and query reads from BigQuery at pipeline
runtime.:::
read_requests = p | beam.Create([
ReadFromBigQueryRequest(query='SELECT * FROM mydataset.mytable'),
ReadFromBigQueryRequest(table='myproject.mydataset.mytable')])
results = read_requests | ReadAllFromBigQuery()
A good application for this transform is in streaming pipelines to
refresh a side input coming from BigQuery. This would work like so:::
side_input = (
p
| 'PeriodicImpulse' >> PeriodicImpulse(
first_timestamp, last_timestamp, interval, True)
| 'MapToReadRequest' >> beam.Map(
lambda x: ReadFromBigQueryRequest(table='dataset.table'))
| beam.io.ReadAllFromBigQuery())
main_input = (
p
| 'MpImpulse' >> beam.Create(sample_main_input_elements)
|
'MapMpToTimestamped' >> beam.Map(lambda src: TimestampedValue(src, src))
| 'WindowMpInto' >> beam.WindowInto(
window.FixedWindows(main_input_windowing_interval)))
result = (
main_input
| 'ApplyCrossJoin' >> beam.FlatMap(
cross_join, rights=beam.pvalue.AsIter(side_input)))
**Note**: This transform is supported on Portable and Dataflow v2 runners.
**Note**: This transform does not currently clean up temporary datasets
created for its execution. (BEAM-11359)
Writing Data to BigQuery
========================
The `WriteToBigQuery` transform is the recommended way of writing data to
BigQuery. It supports a large set of parameters to customize how you'd like to
write to BigQuery.
Table References
----------------
This transform allows you to provide static `project`, `dataset` and `table`
parameters which point to a specific BigQuery table to be created. The `table`
parameter can also be a dynamic parameter (i.e. a callable), which receives an
element to be written to BigQuery, and returns the table that that element
should be sent to.
You may also provide a tuple of PCollectionView elements to be passed as side
inputs to your callable. For example, suppose that one wishes to send
events of different types to different tables, and the table names are
computed at pipeline runtime, one may do something like the following::
with Pipeline() as p:
elements = (p | 'Create elements' >> beam.Create([
{'type': 'error', 'timestamp': '12:34:56', 'message': 'bad'},
{'type': 'user_log', 'timestamp': '12:34:59', 'query': 'flu symptom'},
]))
table_names = (p | 'Create table_names' >> beam.Create([
('error', 'my_project:dataset1.error_table_for_today'),
('user_log', 'my_project:dataset1.query_table_for_today'),
]))
table_names_dict = beam.pvalue.AsDict(table_names)
elements | beam.io.gcp.bigquery.WriteToBigQuery(
table=lambda row, table_dict: table_dict[row['type']],
table_side_inputs=(table_names_dict,))
In the example above, the `table_dict` argument passed to the function in
`table_dict` is the side input coming from `table_names_dict`, which is passed
as part of the `table_side_inputs` argument.
Schemas
---------
This transform also allows you to provide a static or dynamic `schema`
parameter (i.e. a callable).
If providing a callable, this should take in a table reference (as returned by
the `table` parameter), and return the corresponding schema for that table.
This allows to provide different schemas for different tables::
def compute_table_name(row):
...
errors_schema = {'fields': [
{'name': 'type', 'type': 'STRING', 'mode': 'NULLABLE'},
{'name': 'message', 'type': 'STRING', 'mode': 'NULLABLE'}]}
queries_schema = {'fields': [
{'name': 'type', 'type': 'STRING', 'mode': 'NULLABLE'},
{'name': 'query', 'type': 'STRING', 'mode': 'NULLABLE'}]}
with Pipeline() as p:
elements = (p | beam.Create([
{'type': 'error', 'timestamp': '12:34:56', 'message': 'bad'},
{'type': 'user_log', 'timestamp': '12:34:59', 'query': 'flu symptom'},
]))
elements | beam.io.gcp.bigquery.WriteToBigQuery(
table=compute_table_name,
schema=lambda table: (errors_schema
if 'errors' in table
else queries_schema))
It may be the case that schemas are computed at pipeline runtime. In cases
like these, one can also provide a `schema_side_inputs` parameter, which is
a tuple of PCollectionViews to be passed to the schema callable (much like
the `table_side_inputs` parameter).
Additional Parameters for BigQuery Tables
-----------------------------------------
This sink is able to create tables in BigQuery if they don't already exist. It
also relies on creating temporary tables when performing file loads.
The WriteToBigQuery transform creates tables using the BigQuery API by
inserting a load job (see the API reference [1]), or by inserting a new table
(see the API reference for that [2][3]).
When creating a new BigQuery table, there are a number of extra parameters
that one may need to specify. For example, clustering, partitioning, data
encoding, etc. It is possible to provide these additional parameters by
passing a Python dictionary as `additional_bq_parameters` to the transform.
As an example, to create a table that has specific partitioning, and
clustering properties, one would do the following::
additional_bq_parameters = {
'timePartitioning': {'type': 'DAY'},
'clustering': {'fields': ['country']}}
with Pipeline() as p:
elements = (p | beam.Create([
{'country': 'mexico', 'timestamp': '12:34:56', 'query': 'acapulco'},
{'country': 'canada', 'timestamp': '12:34:59', 'query': 'influenza'},
]))
elements | beam.io.gcp.bigquery.WriteToBigQuery(
table='project_name1:dataset_2.query_events_table',
additional_bq_parameters=additional_bq_parameters)
Much like the schema case, the parameter with `additional_bq_parameters` can
also take a callable that receives a table reference.
[1] https://cloud.google.com/bigquery/docs/reference/rest/v2/Job\
#jobconfigurationload
[2] https://cloud.google.com/bigquery/docs/reference/rest/v2/tables/insert
[3] https://cloud.google.com/bigquery/docs/reference/rest/v2/tables#resource
Chaining of operations after WriteToBigQuery
--------------------------------------------
WritToBigQuery returns an object with several PCollections that consist of
metadata about the write operations. These are useful to inspect the write
operation and follow with the results::
schema = {'fields': [
{'name': 'column', 'type': 'STRING', 'mode': 'NULLABLE'}]}
error_schema = {'fields': [
{'name': 'destination', 'type': 'STRING', 'mode': 'NULLABLE'},
{'name': 'row', 'type': 'STRING', 'mode': 'NULLABLE'},
{'name': 'error_message', 'type': 'STRING', 'mode': 'NULLABLE'}]}
with Pipeline() as p:
result = (p
| 'Create Columns' >> beam.Create([
{'column': 'value'},
{'bad_column': 'bad_value'}
])
| 'Write Data' >> WriteToBigQuery(
method=WriteToBigQuery.Method.STREAMING_INSERTS,
table=my_table,
schema=schema,
insert_retry_strategy=RetryStrategy.RETRY_NEVER
))
_ = (result.failed_rows_with_errors
| 'Get Errors' >> beam.Map(lambda e: {
"destination": e[0],
"row": json.dumps(e[1]),
"error_message": e[2][0]['message']
})
| 'Write Errors' >> WriteToBigQuery(
method=WriteToBigQuery.Method.STREAMING_INSERTS,
table=error_log_table,
schema=error_schema,
))
Often, the simplest use case is to chain an operation after writing data to
BigQuery.To do this, one can chain the operation after one of the output
PCollections. A generic way in which this operation (independent of write
method) could look like::
def chain_after(result):
try:
# This works for FILE_LOADS, where we run load and possibly copy jobs.
return (result.destination_load_jobid_pairs,
result.destination_copy_jobid_pairs) | beam.Flatten()
except AttributeError:
# Works for STREAMING_INSERTS, where we return the rows BigQuery rejected
return result.failed_rows
result = (pcoll | WriteToBigQuery(...))
_ = (chain_after(result)
| beam.Reshuffle() # Force a 'commit' of the intermediate date
| MyOperationAfterWriteToBQ())
Attributes can be accessed using dot notation or bracket notation:
result.failed_rows <--> result['FailedRows']
result.failed_rows_with_errors <--> result['FailedRowsWithErrors']
result.destination_load_jobid_pairs <--> result['destination_load_jobid_pairs']
result.destination_file_pairs <--> result['destination_file_pairs']
result.destination_copy_jobid_pairs <--> result['destination_copy_jobid_pairs']
Writing with Storage Write API using Cross Language
---------------------------------------------------
This sink is able to write with BigQuery's Storage Write API. To do so, specify
the method `WriteToBigQuery.Method.STORAGE_WRITE_API`. This will use the
StorageWriteToBigQuery() transform to discover and use the Java implementation.
Using this transform directly will require the use of beam.Row() elements.
Similar to streaming inserts, it returns two dead-letter queue PCollections:
one containing just the failed rows and the other containing failed rows and
errors. They can be accessed with `failed_rows` and `failed_rows_with_errors`,
respectively. See the examples above for how to do this.
*** Short introduction to BigQuery concepts ***
Tables have rows (TableRow) and each row has cells (TableCell).
A table has a schema (TableSchema), which in turn describes the schema of each
cell (TableFieldSchema). The terms field and cell are used interchangeably.
TableSchema: Describes the schema (types and order) for values in each row.
Has one attribute, 'field', which is list of TableFieldSchema objects.
TableFieldSchema: Describes the schema (type, name) for one field.
Has several attributes, including 'name' and 'type'. Common values for
the type attribute are: 'STRING', 'INTEGER', 'FLOAT', 'BOOLEAN', 'NUMERIC',
'GEOGRAPHY'.
All possible values are described at:
https://cloud.google.com/bigquery/docs/reference/standard-sql/data-types
TableRow: Holds all values in a table row. Has one attribute, 'f', which is a
list of TableCell instances.
TableCell: Holds the value for one cell (or field). Has one attribute,
'v', which is a JsonValue instance. This class is defined in
apitools.base.py.extra_types.py module.
As of Beam 2.7.0, the NUMERIC data type is supported. This data type supports
high-precision decimal numbers (precision of 38 digits, scale of 9 digits).
The GEOGRAPHY data type works with Well-Known Text (See
https://en.wikipedia.org/wiki/Well-known_text) format for reading and writing
to BigQuery.
BigQuery IO requires values of BYTES datatype to be encoded using base64
encoding when writing to BigQuery.
**Updates to the I/O connector code**
For any significant updates to this I/O connector, please consider involving
corresponding code reviewers mentioned in
https://github.com/apache/beam/blob/master/sdks/python/OWNERS
"""
# pytype: skip-file
import collections
import io
import itertools
import json
import logging
import random
import secrets
import time
import uuid
import warnings
from dataclasses import dataclass
from typing import Dict
from typing import List
from typing import Optional
from typing import Tuple
from typing import Union
import fastavro
from objsize import get_deep_size
import apache_beam as beam
from apache_beam import coders
from apache_beam import pvalue
from apache_beam.internal.gcp.json_value import from_json_value
from apache_beam.internal.gcp.json_value import to_json_value
from apache_beam.io import range_trackers
from apache_beam.io.avroio import _create_avro_source as create_avro_source
from apache_beam.io.filesystems import CompressionTypes
from apache_beam.io.filesystems import FileSystems
from apache_beam.io.gcp import bigquery_schema_tools
from apache_beam.io.gcp import bigquery_tools
from apache_beam.io.gcp.bigquery_io_metadata import create_bigquery_io_metadata
from apache_beam.io.gcp.bigquery_read_internal import _BigQueryReadSplit
from apache_beam.io.gcp.bigquery_read_internal import _JsonToDictCoder
from apache_beam.io.gcp.bigquery_read_internal import _PassThroughThenCleanup
from apache_beam.io.gcp.bigquery_read_internal import _PassThroughThenCleanupTempDatasets
from apache_beam.io.gcp.bigquery_read_internal import bigquery_export_destination_uri
from apache_beam.io.gcp.bigquery_tools import RetryStrategy
from apache_beam.io.gcp.internal.clients import bigquery
from apache_beam.io.iobase import BoundedSource
from apache_beam.io.iobase import RangeTracker
from apache_beam.io.iobase import SDFBoundedSourceReader
from apache_beam.io.iobase import SourceBundle
from apache_beam.io.textio import _TextSource as TextSource
from apache_beam.metrics import Metrics
from apache_beam.options import value_provider as vp
from apache_beam.options.pipeline_options import DebugOptions
from apache_beam.options.pipeline_options import GoogleCloudOptions
from apache_beam.options.pipeline_options import StandardOptions
from apache_beam.options.value_provider import StaticValueProvider
from apache_beam.options.value_provider import ValueProvider
from apache_beam.options.value_provider import check_accessible
from apache_beam.pvalue import PCollection
from apache_beam.transforms import DoFn
from apache_beam.transforms import ParDo
from apache_beam.transforms import PTransform
from apache_beam.transforms.display import DisplayDataItem
from apache_beam.transforms.external import BeamJarExpansionService
from apache_beam.transforms.external import SchemaAwareExternalTransform
from apache_beam.transforms.sideinputs import SIDE_INPUT_PREFIX
from apache_beam.transforms.sideinputs import get_sideinput_index
from apache_beam.transforms.util import ReshufflePerKey
from apache_beam.transforms.window import GlobalWindows
from apache_beam.typehints.row_type import RowTypeConstraint
from apache_beam.typehints.schemas import schema_from_element_type
from apache_beam.utils import retry
from apache_beam.utils.annotations import deprecated
try:
from apache_beam.io.gcp.internal.clients.bigquery import DatasetReference
from apache_beam.io.gcp.internal.clients.bigquery import TableReference
from apache_beam.io.gcp.internal.clients.bigquery import JobReference
except ImportError:
DatasetReference = None
TableReference = None
JobReference = None
_LOGGER = logging.getLogger(__name__)
try:
import google.cloud.bigquery_storage_v1 as bq_storage
except ImportError:
_LOGGER.info(
'No module named google.cloud.bigquery_storage_v1. '
'As a result, the ReadFromBigQuery transform *CANNOT* be '
'used with `method=DIRECT_READ`.')
__all__ = [
'TableRowJsonCoder',
'BigQueryDisposition',
'BigQuerySource',
'BigQuerySink',
'BigQueryQueryPriority',
'WriteToBigQuery',
'WriteResult',
'ReadFromBigQuery',
'ReadFromBigQueryRequest',
'ReadAllFromBigQuery',
'SCHEMA_AUTODETECT',
]
"""
Template for BigQuery jobs created by BigQueryIO. This template is:
`"beam_bq_job_{job_type}_{job_id}_{step_id}_{random}"`, where:
- `job_type` represents the BigQuery job type (e.g. extract / copy / load /
query).
- `job_id` is the Beam job name.
- `step_id` is a UUID representing the Dataflow step that created the
BQ job.
- `random` is a random string.
NOTE: This job name template does not have backwards compatibility guarantees.
"""
BQ_JOB_NAME_TEMPLATE = "beam_bq_job_{job_type}_{job_id}_{step_id}{random}"
"""
The maximum number of times that a bundle of rows that errors out should be
sent for insertion into BigQuery.
The default is 10,000 with exponential backoffs, so a bundle of rows may be
tried for a very long time. You may reduce this property to reduce the number
of retries.
"""
MAX_INSERT_RETRIES = 10000
"""
The maximum byte size for a BigQuery legacy streaming insert payload.
Note: The actual limit is 10MB, but we set it to 9MB to make room for request
overhead: https://cloud.google.com/bigquery/quotas#streaming_inserts
"""
MAX_INSERT_PAYLOAD_SIZE = 9 << 20
@deprecated(since='2.11.0', current="bigquery_tools.parse_table_reference")
def _parse_table_reference(table, dataset=None, project=None):
return bigquery_tools.parse_table_reference(table, dataset, project)
@deprecated(
since='2.11.0', current="bigquery_tools.parse_table_schema_from_json")
def parse_table_schema_from_json(schema_string):
return bigquery_tools.parse_table_schema_from_json(schema_string)
@deprecated(since='2.11.0', current="bigquery_tools.default_encoder")
def default_encoder(obj):
return bigquery_tools.default_encoder(obj)
@deprecated(since='2.11.0', current="bigquery_tools.RowAsDictJsonCoder")
def RowAsDictJsonCoder(*args, **kwargs):
return bigquery_tools.RowAsDictJsonCoder(*args, **kwargs)
@deprecated(since='2.11.0', current="bigquery_tools.BigQueryWrapper")
def BigQueryWrapper(*args, **kwargs):
return bigquery_tools.BigQueryWrapper(*args, **kwargs)
[docs]class TableRowJsonCoder(coders.Coder):
"""A coder for a TableRow instance to/from a JSON string.
Note that the encoding operation (used when writing to sinks) requires the
table schema in order to obtain the ordered list of field names. Reading from
sources on the other hand does not need the table schema.
"""
def __init__(self, table_schema=None):
# The table schema is needed for encoding TableRows as JSON (writing to
# sinks) because the ordered list of field names is used in the JSON
# representation.
self.table_schema = table_schema
# Precompute field names since we need them for row encoding.
if self.table_schema:
self.field_names = tuple(fs.name for fs in self.table_schema.fields)
self.field_types = tuple(fs.type for fs in self.table_schema.fields)
[docs] def encode(self, table_row):
if self.table_schema is None:
raise AttributeError(
'The TableRowJsonCoder requires a table schema for '
'encoding operations. Please specify a table_schema argument.')
try:
return json.dumps(
collections.OrderedDict(
zip(
self.field_names,
[from_json_value(f.v) for f in table_row.f])),
allow_nan=False,
default=bigquery_tools.default_encoder)
except ValueError as e:
raise ValueError('%s. %s' % (e, bigquery_tools.JSON_COMPLIANCE_ERROR))
[docs] def decode(self, encoded_table_row):
od = json.loads(
encoded_table_row, object_pairs_hook=collections.OrderedDict)
return bigquery.TableRow(
f=[bigquery.TableCell(v=to_json_value(e)) for e in od.values()])
[docs]class BigQueryDisposition(object):
"""Class holding standard strings used for create and write dispositions."""
CREATE_NEVER = 'CREATE_NEVER'
CREATE_IF_NEEDED = 'CREATE_IF_NEEDED'
WRITE_TRUNCATE = 'WRITE_TRUNCATE'
WRITE_APPEND = 'WRITE_APPEND'
WRITE_EMPTY = 'WRITE_EMPTY'
[docs] @staticmethod
def validate_create(disposition):
values = (
BigQueryDisposition.CREATE_NEVER, BigQueryDisposition.CREATE_IF_NEEDED)
if disposition not in values:
raise ValueError(
'Invalid create disposition %s. Expecting %s' % (disposition, values))
return disposition
[docs] @staticmethod
def validate_write(disposition):
values = (
BigQueryDisposition.WRITE_TRUNCATE,
BigQueryDisposition.WRITE_APPEND,
BigQueryDisposition.WRITE_EMPTY)
if disposition not in values:
raise ValueError(
'Invalid write disposition %s. Expecting %s' % (disposition, values))
return disposition
[docs]class BigQueryQueryPriority(object):
"""Class holding standard strings used for query priority."""
INTERACTIVE = 'INTERACTIVE'
BATCH = 'BATCH'
# -----------------------------------------------------------------------------
# BigQuerySource, BigQuerySink.
[docs]@deprecated(since='2.25.0', current="ReadFromBigQuery")
def BigQuerySource(
table=None,
dataset=None,
project=None,
query=None,
validate=False,
coder=None,
use_standard_sql=False,
flatten_results=True,
kms_key=None,
use_dataflow_native_source=False):
if use_dataflow_native_source:
warnings.warn(
"Native sources no longer implemented; "
"falling back to standard Beam source.")
return ReadFromBigQuery(
table=table,
dataset=dataset,
project=project,
query=query,
validate=validate,
coder=coder,
use_standard_sql=use_standard_sql,
flatten_results=flatten_results,
use_json_exports=True,
kms_key=kms_key)
@deprecated(since='2.25.0', current="ReadFromBigQuery")
def _BigQuerySource(*args, **kwargs):
"""A source based on a BigQuery table."""
warnings.warn(
"Native sources no longer implemented; "
"falling back to standard Beam source.")
return ReadFromBigQuery(*args, **kwargs)
# TODO(https://github.com/apache/beam/issues/21622): remove the serialization
# restriction in transform implementation once InteractiveRunner can work
# without runner api roundtrips.
@dataclass
class _BigQueryExportResult:
coder: beam.coders.Coder
paths: List[str]
class _CustomBigQuerySource(BoundedSource):
def __init__(
self,
method,
gcs_location=None,
table=None,
dataset=None,
project=None,
query=None,
validate=False,
pipeline_options=None,
coder=None,
use_standard_sql=False,
flatten_results=True,
kms_key=None,
bigquery_job_labels=None,
use_json_exports=False,
job_name=None,
step_name=None,
unique_id=None,
temp_dataset=None,
query_priority=BigQueryQueryPriority.BATCH):
if table is not None and query is not None:
raise ValueError(
'Both a BigQuery table and a query were specified.'
' Please specify only one of these.')
elif table is None and query is None:
raise ValueError('A BigQuery table or a query must be specified')
elif table is not None:
self.table_reference = bigquery_tools.parse_table_reference(
table, dataset, project)
self.query = None
self.use_legacy_sql = True
else:
if isinstance(query, str):
query = StaticValueProvider(str, query)
self.query = query
# TODO(BEAM-1082): Change the internal flag to be standard_sql
self.use_legacy_sql = not use_standard_sql
self.table_reference = None
self.method = method
self.gcs_location = gcs_location
self.project = project
self.validate = validate
self.flatten_results = flatten_results
self.coder = coder or _JsonToDictCoder
self.kms_key = kms_key
self.export_result = None
self.options = pipeline_options
self.bq_io_metadata = None # Populate in setup, as it may make an RPC
self.bigquery_job_labels = bigquery_job_labels or {}
self.use_json_exports = use_json_exports
self.temp_dataset = temp_dataset
self.query_priority = query_priority
self._job_name = job_name or 'BQ_EXPORT_JOB'
self._step_name = step_name
self._source_uuid = unique_id
def _get_bq_metadata(self):
if not self.bq_io_metadata:
self.bq_io_metadata = create_bigquery_io_metadata(self._step_name)
return self.bq_io_metadata
def display_data(self):
export_format = 'JSON' if self.use_json_exports else 'AVRO'
return {
'method': str(self.method),
'table': str(self.table_reference),
'query': str(self.query),
'project': str(self.project),
'use_legacy_sql': self.use_legacy_sql,
'bigquery_job_labels': json.dumps(self.bigquery_job_labels),
'export_file_format': export_format,
'launchesBigQueryJobs': DisplayDataItem(
True, label="This Dataflow job launches bigquery jobs."),
}
def estimate_size(self):
bq = bigquery_tools.BigQueryWrapper.from_pipeline_options(self.options)
if self.table_reference is not None:
table_ref = self.table_reference
if (isinstance(self.table_reference, vp.ValueProvider) and
self.table_reference.is_accessible()):
table_ref = bigquery_tools.parse_table_reference(
self.table_reference.get(), project=self._get_project())
elif isinstance(self.table_reference, vp.ValueProvider):
# Size estimation is best effort. We return None as we have
# no access to the table that we're querying.
return None
if not table_ref.projectId:
table_ref.projectId = self._get_project()
table = bq.get_table(
table_ref.projectId, table_ref.datasetId, table_ref.tableId)
return int(table.numBytes)
elif self.query is not None and self.query.is_accessible():
project = self._get_project()
query_job_name = bigquery_tools.generate_bq_job_name(
self._job_name,
self._source_uuid,
bigquery_tools.BigQueryJobTypes.QUERY,
'%s_%s' % (int(time.time()), random.randint(0, 1000)))
job = bq._start_query_job(
project,
self.query.get(),
self.use_legacy_sql,
self.flatten_results,
job_id=query_job_name,
priority=self.query_priority,
dry_run=True,
kms_key=self.kms_key,
job_labels=self._get_bq_metadata().add_additional_bq_job_labels(
self.bigquery_job_labels))
if job.statistics.totalBytesProcessed is None:
# Some queries may not have access to `totalBytesProcessed` as a
# result of row-level security.
# > BigQuery hides sensitive statistics on all queries against
# > tables with row-level security.
# See cloud.google.com/bigquery/docs/managing-row-level-security
# and cloud.google.com/bigquery/docs/best-practices-row-level-security
return None
return int(job.statistics.totalBytesProcessed)
else:
# Size estimation is best effort. We return None as we have
# no access to the query that we're running.
return None
def _get_project(self):
"""Returns the project that queries and exports will be billed to."""
project = self.options.view_as(GoogleCloudOptions).project
if isinstance(project, vp.ValueProvider):
project = project.get()
if self.temp_dataset:
return self.temp_dataset.projectId
if not project:
project = self.project
return project
def _create_source(self, path, coder):
if not self.use_json_exports:
return create_avro_source(path)
else:
return TextSource(
path,
min_bundle_size=0,
compression_type=CompressionTypes.UNCOMPRESSED,
strip_trailing_newlines=True,
coder=coder)
def split(self, desired_bundle_size, start_position=None, stop_position=None):
if self.export_result is None:
bq = bigquery_tools.BigQueryWrapper(
temp_dataset_id=(
self.temp_dataset.datasetId if self.temp_dataset else None),
client=bigquery_tools.BigQueryWrapper._bigquery_client(self.options))
if self.query is not None:
self._setup_temporary_dataset(bq)
self.table_reference = self._execute_query(bq)
if isinstance(self.table_reference, vp.ValueProvider):
self.table_reference = bigquery_tools.parse_table_reference(
self.table_reference.get(), project=self._get_project())
elif not self.table_reference.projectId:
self.table_reference.projectId = self._get_project()
schema, metadata_list = self._export_files(bq)
self.export_result = _BigQueryExportResult(
coder=self.coder(schema),
paths=[metadata.path for metadata in metadata_list])
if self.query is not None:
bq.clean_up_temporary_dataset(self._get_project())
for path in self.export_result.paths:
source = self._create_source(path, self.export_result.coder)
yield SourceBundle(
weight=1.0, source=source, start_position=None, stop_position=None)
def get_range_tracker(self, start_position, stop_position):
class CustomBigQuerySourceRangeTracker(RangeTracker):
"""A RangeTracker that always returns positions as None."""
def start_position(self):
return None
def stop_position(self):
return None
return CustomBigQuerySourceRangeTracker()
def read(self, range_tracker):
raise NotImplementedError('BigQuery source must be split before being read')
@check_accessible(['query'])
def _setup_temporary_dataset(self, bq):
if self.temp_dataset:
# Temp dataset was provided by the user so we can just return.
return
location = bq.get_query_location(
self._get_project(), self.query.get(), self.use_legacy_sql)
bq.create_temporary_dataset(self._get_project(), location)
@check_accessible(['query'])
def _execute_query(self, bq):
query_job_name = bigquery_tools.generate_bq_job_name(
self._job_name,
self._source_uuid,
bigquery_tools.BigQueryJobTypes.QUERY,
'%s_%s' % (int(time.time()), random.randint(0, 1000)))
job = bq._start_query_job(
self._get_project(),
self.query.get(),
self.use_legacy_sql,
self.flatten_results,
job_id=query_job_name,
priority=self.query_priority,
kms_key=self.kms_key,
job_labels=self._get_bq_metadata().add_additional_bq_job_labels(
self.bigquery_job_labels))
job_ref = job.jobReference
bq.wait_for_bq_job(job_ref, max_retries=0)
return bq._get_temp_table(self._get_project())
def _export_files(self, bq):
"""Runs a BigQuery export job.
Returns:
bigquery.TableSchema instance, a list of FileMetadata instances
"""
job_labels = self._get_bq_metadata().add_additional_bq_job_labels(
self.bigquery_job_labels)
export_job_name = bigquery_tools.generate_bq_job_name(
self._job_name,
self._source_uuid,
bigquery_tools.BigQueryJobTypes.EXPORT,
'%s_%s' % (int(time.time()), random.randint(0, 1000)))
temp_location = self.options.view_as(GoogleCloudOptions).temp_location
gcs_location = bigquery_export_destination_uri(
self.gcs_location, temp_location, self._source_uuid)
try:
if self.use_json_exports:
job_ref = bq.perform_extract_job([gcs_location],
export_job_name,
self.table_reference,
bigquery_tools.FileFormat.JSON,
project=self._get_project(),
job_labels=job_labels,
include_header=False)
else:
job_ref = bq.perform_extract_job([gcs_location],
export_job_name,
self.table_reference,
bigquery_tools.FileFormat.AVRO,
project=self._get_project(),
include_header=False,
job_labels=job_labels,
use_avro_logical_types=True)
bq.wait_for_bq_job(job_ref)
except Exception as exn: # pylint: disable=broad-except
# The error messages thrown in this case are generic and misleading,
# so leave this breadcrumb in case it's the root cause.
logging.warning(
"Error exporting table: %s. "
"Note that external tables cannot be exported: "
"https://cloud.google.com/bigquery/docs/external-tables"
"#external_table_limitations",
exn)
raise
metadata_list = FileSystems.match([gcs_location])[0].metadata_list
if isinstance(self.table_reference, vp.ValueProvider):
table_ref = bigquery_tools.parse_table_reference(
self.table_reference.get(), project=self.project)
else:
table_ref = self.table_reference
table = bq.get_table(
table_ref.projectId, table_ref.datasetId, table_ref.tableId)
return table.schema, metadata_list
class _CustomBigQueryStorageSource(BoundedSource):
"""A base class for BoundedSource implementations which read from BigQuery
using the BigQuery Storage API.
Args:
table (str, TableReference): The ID of the table. If **dataset** argument is
:data:`None` then the table argument must contain the entire table
reference specified as: ``'PROJECT:DATASET.TABLE'`` or must specify a
TableReference.
dataset (str): Optional ID of the dataset containing this table or
:data:`None` if the table argument specifies a TableReference.
project (str): Optional ID of the project containing this table or
:data:`None` if the table argument specifies a TableReference.
selected_fields (List[str]): Optional List of names of the fields in the
table that should be read. If empty, all fields will be read. If the
specified field is a nested field, all the sub-fields in the field will be
selected. The output field order is unrelated to the order of fields in
selected_fields.
row_restriction (str): Optional SQL text filtering statement, similar to a
WHERE clause in a query. Aggregates are not supported. Restricted to a
maximum length for 1 MB.
use_native_datetime (bool): If :data:`True`, BigQuery DATETIME fields will
be returned as native Python datetime objects. If :data:`False`,
DATETIME fields will be returned as formatted strings (for example:
2021-01-01T12:59:59). The default is :data:`False`.
"""
# The maximum number of streams which will be requested when creating a read
# session, regardless of the desired bundle size.
MAX_SPLIT_COUNT = 10000
# The minimum number of streams which will be requested when creating a read
# session, regardless of the desired bundle size. Note that the server may
# still choose to return fewer than ten streams based on the layout of the
# table.
MIN_SPLIT_COUNT = 10
def __init__(
self,
method: str,
query_priority: [BigQueryQueryPriority] = BigQueryQueryPriority.BATCH,
table: Optional[Union[str, TableReference]] = None,
dataset: Optional[str] = None,
project: Optional[str] = None,
query: Optional[str] = None,
selected_fields: Optional[List[str]] = None,
row_restriction: Optional[str] = None,
pipeline_options: Optional[GoogleCloudOptions] = None,
unique_id: Optional[uuid.UUID] = None,
bigquery_job_labels: Optional[Dict] = None,
bigquery_dataset_labels: Optional[Dict] = None,
job_name: Optional[str] = None,
step_name: Optional[str] = None,
use_standard_sql: Optional[bool] = False,
flatten_results: Optional[bool] = True,
kms_key: Optional[str] = None,
temp_dataset: Optional[DatasetReference] = None,
temp_table: Optional[TableReference] = None,
use_native_datetime: Optional[bool] = False):
if table is not None and query is not None:
raise ValueError(
'Both a BigQuery table and a query were specified.'
' Please specify only one of these.')
elif table is None and query is None:
raise ValueError('A BigQuery table or a query must be specified')
elif table is not None:
self.table_reference = bigquery_tools.parse_table_reference(
table, dataset, project)
self.query = None
self.use_legacy_sql = True
else:
if isinstance(query, str):
query = StaticValueProvider(str, query)
self.query = query
# TODO(BEAM-1082): Change the internal flag to be standard_sql
self.use_legacy_sql = not use_standard_sql
self.table_reference = None
self.method = method
self.project = project
self.selected_fields = selected_fields
self.row_restriction = row_restriction
self.pipeline_options = pipeline_options
self.split_result = None
self.bigquery_job_labels = bigquery_job_labels or {}
self.bigquery_dataset_labels = bigquery_dataset_labels or {}
self.bq_io_metadata = None # Populate in setup, as it may make an RPC
self.flatten_results = flatten_results
self.kms_key = kms_key
self.temp_table = temp_table
self.query_priority = query_priority
self.use_native_datetime = use_native_datetime
self._job_name = job_name or 'BQ_DIRECT_READ_JOB'
self._step_name = step_name
self._source_uuid = unique_id
def _get_parent_project(self):
"""Returns the project that will be billed."""
if self.temp_table:
return self.temp_table.projectId
project = self.pipeline_options.view_as(GoogleCloudOptions).project
if isinstance(project, vp.ValueProvider):
project = project.get()
if not project:
project = self.project
return project
def _get_table_size(self, bq, table_reference):
project = (
table_reference.projectId
if table_reference.projectId else self._get_parent_project())
table = bq.get_table(
project, table_reference.datasetId, table_reference.tableId)
return table.numBytes
def _get_bq_metadata(self):
if not self.bq_io_metadata:
self.bq_io_metadata = create_bigquery_io_metadata(self._step_name)
return self.bq_io_metadata
@check_accessible(['query'])
def _setup_temporary_dataset(self, bq):
if self.temp_table:
# Temp dataset was provided by the user so we can just return.
return
location = bq.get_query_location(
self._get_parent_project(), self.query.get(), self.use_legacy_sql)
_LOGGER.warning("### Labels: %s", str(self.bigquery_dataset_labels))
bq.create_temporary_dataset(
self._get_parent_project(), location, self.bigquery_dataset_labels)
@check_accessible(['query'])
def _execute_query(self, bq):
query_job_name = bigquery_tools.generate_bq_job_name(
self._job_name,
self._source_uuid,
bigquery_tools.BigQueryJobTypes.QUERY,
'%s_%s' % (int(time.time()), random.randint(0, 1000)))
job = bq._start_query_job(
self._get_parent_project(),
self.query.get(),
self.use_legacy_sql,
self.flatten_results,
job_id=query_job_name,
priority=self.query_priority,
kms_key=self.kms_key,
job_labels=self._get_bq_metadata().add_additional_bq_job_labels(
self.bigquery_job_labels))
job_ref = job.jobReference
bq.wait_for_bq_job(job_ref, max_retries=0)
table_reference = bq._get_temp_table(self._get_parent_project())
return table_reference
def display_data(self):
return {
'method': self.method,
'output_format': 'ARROW' if self.use_native_datetime else 'AVRO',
'project': str(self.project),
'table_reference': str(self.table_reference),
'query': str(self.query),
'use_legacy_sql': self.use_legacy_sql,
'use_native_datetime': self.use_native_datetime,
'selected_fields': str(self.selected_fields),
'row_restriction': str(self.row_restriction),
'launchesBigQueryJobs': DisplayDataItem(
True, label="This Dataflow job launches bigquery jobs."),
}
def estimate_size(self):
# Returns the pre-filtering size of the (temporary) table being read.
bq = bigquery_tools.BigQueryWrapper.from_pipeline_options(
self.pipeline_options)
if self.table_reference is not None:
table_ref = self.table_reference
if (isinstance(self.table_reference, vp.ValueProvider) and
self.table_reference.is_accessible()):
table_ref = bigquery_tools.parse_table_reference(
self.table_reference.get(), project=self._get_project())
elif isinstance(self.table_reference, vp.ValueProvider):
# Size estimation is best effort. We return None as we have
# no access to the table that we're querying.
return None
return self._get_table_size(bq, table_ref)
elif self.query is not None and self.query.is_accessible():
query_job_name = bigquery_tools.generate_bq_job_name(
self._job_name,
self._source_uuid,
bigquery_tools.BigQueryJobTypes.QUERY,
'%s_%s' % (int(time.time()), random.randint(0, 1000)))
job = bq._start_query_job(
self._get_parent_project(),
self.query.get(),
self.use_legacy_sql,
self.flatten_results,
job_id=query_job_name,
priority=self.query_priority,
dry_run=True,
kms_key=self.kms_key,
job_labels=self._get_bq_metadata().add_additional_bq_job_labels(
self.bigquery_job_labels))
if job.statistics.totalBytesProcessed is None:
# Some queries may not have access to `totalBytesProcessed` as a
# result of row-level security
# > BigQuery hides sensitive statistics on all queries against
# > tables with row-level security.
# See cloud.google.com/bigquery/docs/managing-row-level-security
# and cloud.google.com/bigquery/docs/best-practices-row-level-security
return None
return int(job.statistics.totalBytesProcessed)
else:
# Size estimation is best effort. We return None as we have
# no access to the query that we're running.
return None
def split(self, desired_bundle_size, start_position=None, stop_position=None):
if self.split_result is None:
bq = bigquery_tools.BigQueryWrapper(
temp_table_ref=(self.temp_table if self.temp_table else None),
client=bigquery_tools.BigQueryWrapper._bigquery_client(
self.pipeline_options))
if self.query is not None:
self._setup_temporary_dataset(bq)
self.table_reference = self._execute_query(bq)
requested_session = bq_storage.types.ReadSession()
requested_session.table = 'projects/{}/datasets/{}/tables/{}'.format(
self.table_reference.projectId,
self.table_reference.datasetId,
self.table_reference.tableId)
if self.use_native_datetime:
requested_session.data_format = bq_storage.types.DataFormat.ARROW
requested_session.read_options\
.arrow_serialization_options.buffer_compression = \
bq_storage.types.ArrowSerializationOptions.CompressionCodec.LZ4_FRAME
else:
requested_session.data_format = bq_storage.types.DataFormat.AVRO
if self.selected_fields is not None:
requested_session.read_options.selected_fields = self.selected_fields
if self.row_restriction is not None:
requested_session.read_options.row_restriction = self.row_restriction
storage_client = bq_storage.BigQueryReadClient()
stream_count = 0
if desired_bundle_size > 0:
table_size = self._get_table_size(bq, self.table_reference)
stream_count = min(
int(table_size / desired_bundle_size),
_CustomBigQueryStorageSource.MAX_SPLIT_COUNT)
stream_count = max(
stream_count, _CustomBigQueryStorageSource.MIN_SPLIT_COUNT)
parent = 'projects/{}'.format(self.table_reference.projectId)
read_session = storage_client.create_read_session(
parent=parent,
read_session=requested_session,
max_stream_count=stream_count)
if self.use_native_datetime:
display_schema = "Arrow Schema:" + str(read_session.arrow_schema)
else:
display_schema = "Avro Schema:" + str(read_session.avro_schema)
_LOGGER.info(
'Sent BigQuery Storage API CreateReadSession request: \n %s \n'
'Received %d streams\ndata_format: %s\n'
'estimated_total_bytes_scanned: %s\n%s.',
requested_session,
len(read_session.streams),
read_session.data_format,
read_session.estimated_total_bytes_scanned,
display_schema)
self.split_result = [
_CustomBigQueryStorageStreamSource(
stream.name, self.use_native_datetime)
for stream in read_session.streams
]
for source in self.split_result:
yield SourceBundle(
weight=1.0, source=source, start_position=None, stop_position=None)
def get_range_tracker(self, start_position, stop_position):
class NonePositionRangeTracker(RangeTracker):
"""A RangeTracker that always returns positions as None. Prevents the
BigQuery Storage source from being read() before being split()."""
def start_position(self):
return None
def stop_position(self):
return None
return NonePositionRangeTracker()
def read(self, range_tracker):
raise NotImplementedError(
'BigQuery storage source must be split before being read')
class _CustomBigQueryStorageStreamSource(BoundedSource):
"""A source representing a single stream in a read session."""
# Runner will act on this counter on scaling event, if supported
THROTTLE_COUNTER = Metrics.counter(__name__, 'cumulativeThrottlingSeconds')
def __init__(
self, read_stream_name: str, use_native_datetime: Optional[bool] = True):
self.read_stream_name = read_stream_name
self.use_native_datetime = use_native_datetime
def display_data(self):
return {
'output_format': 'ARROW' if self.use_native_datetime else 'AVRO',
'read_stream': str(self.read_stream_name),
'use_native_datetime': str(self.use_native_datetime)
}
def estimate_size(self):
# The size of stream source cannot be estimate due to server-side liquid
# sharding.
# TODO(https://github.com/apache/beam/issues/21126): Implement progress
# reporting.
return None
def split(self, desired_bundle_size, start_position=None, stop_position=None):
# A stream source can't be split without reading from it due to
# server-side liquid sharding. A split will simply return the current source
# for now.
return SourceBundle(
weight=1.0,
source=_CustomBigQueryStorageStreamSource(
self.read_stream_name, self.use_native_datetime),
start_position=None,
stop_position=None)
def get_range_tracker(self, start_position, stop_position):
# TODO(https://github.com/apache/beam/issues/21127): Implement dynamic work
# rebalancing.
assert start_position is None
# Defaulting to the start of the stream.
start_position = 0
# Since the streams are unsplittable we choose OFFSET_INFINITY as the
# default end offset so that all data of the source gets read.
stop_position = range_trackers.OffsetRangeTracker.OFFSET_INFINITY
range_tracker = range_trackers.OffsetRangeTracker(
start_position, stop_position)
# Ensuring that all try_split() calls will be ignored by the Rangetracker.
range_tracker = range_trackers.UnsplittableRangeTracker(range_tracker)
return range_tracker
def read(self, range_tracker):
_LOGGER.info(
"Started BigQuery Storage API read from stream %s.",
self.read_stream_name)
if self.use_native_datetime:
return self.read_arrow()
else:
return self.read_avro()
@staticmethod
def retry_delay_callback(delay):
_LOGGER.info("retry delay: %f", delay)
_CustomBigQueryStorageStreamSource.THROTTLE_COUNTER.inc(delay)
def read_arrow(self):
storage_client = bq_storage.BigQueryReadClient()
row_iter = iter(
storage_client.read_rows(
self.read_stream_name,
retry_delay_callback=self.retry_delay_callback).rows())
row = next(row_iter, None)
# Handling the case where the user might provide very selective filters
# which can result in read_rows_response being empty.
if row is None:
return iter([])
while row is not None:
py_row = dict(map(lambda item: (item[0], item[1].as_py()), row.items()))
row = next(row_iter, None)
yield py_row
def read_avro(self):
storage_client = bq_storage.BigQueryReadClient()
read_rows_iterator = iter(
storage_client.read_rows(
self.read_stream_name,
retry_delay_callback=self.retry_delay_callback))
# Handling the case where the user might provide very selective filters
# which can result in read_rows_response being empty.
first_read_rows_response = next(read_rows_iterator, None)
if first_read_rows_response is None:
return iter([])
row_reader = _ReadReadRowsResponsesWithFastAvro(
read_rows_iterator, first_read_rows_response)
return iter(row_reader)
class _ReadReadRowsResponsesWithFastAvro():
"""An iterator that deserializes ReadRowsResponses using the fastavro
library."""
def __init__(self, read_rows_iterator, read_rows_response):
self.read_rows_iterator = read_rows_iterator
self.read_rows_response = read_rows_response
self.avro_schema = fastavro.parse_schema(
json.loads(self.read_rows_response.avro_schema.schema))
self.bytes_reader = io.BytesIO(
self.read_rows_response.avro_rows.serialized_binary_rows)
def __iter__(self):
return self
def __next__(self):
try:
return fastavro.schemaless_reader(self.bytes_reader, self.avro_schema)
except (StopIteration, EOFError):
self.read_rows_response = next(self.read_rows_iterator, None)
if self.read_rows_response is not None:
self.bytes_reader = io.BytesIO(
self.read_rows_response.avro_rows.serialized_binary_rows)
return fastavro.schemaless_reader(self.bytes_reader, self.avro_schema)
else:
raise StopIteration
[docs]@deprecated(since='2.11.0', current="WriteToBigQuery")
def BigQuerySink(*args, validate=False, **kwargs):
"""A deprecated alias for WriteToBigQuery."""
warnings.warn(
"Native sinks no longer implemented; "
"falling back to standard Beam sink.")
return WriteToBigQuery(*args, validate=validate, **kwargs)
_KNOWN_TABLES = set()
class BigQueryWriteFn(DoFn):
"""A ``DoFn`` that streams writes to BigQuery once the table is created."""
DEFAULT_MAX_BUFFERED_ROWS = 2000
DEFAULT_MAX_BATCH_SIZE = 500
FAILED_ROWS = 'FailedRows'
FAILED_ROWS_WITH_ERRORS = 'FailedRowsWithErrors'
STREAMING_API_LOGGING_FREQUENCY_SEC = 300
def __init__(
self,
batch_size,
schema=None,
create_disposition=None,
write_disposition=None,
kms_key=None,
test_client=None,
max_buffered_rows=None,
retry_strategy=None,
additional_bq_parameters=None,
ignore_insert_ids=False,
with_batched_input=False,
ignore_unknown_columns=False,
max_retries=MAX_INSERT_RETRIES,
max_insert_payload_size=MAX_INSERT_PAYLOAD_SIZE):
"""Initialize a WriteToBigQuery transform.
Args:
batch_size: Number of rows to be written to BQ per streaming API insert.
schema: The schema to be used if the BigQuery table to write has to be
created. This can be either specified as a 'bigquery.TableSchema' object
or a single string of the form 'field1:type1,field2:type2,field3:type3'
that defines a comma separated list of fields. Here 'type' should
specify the BigQuery type of the field. Single string based schemas do
not support nested fields, repeated fields, or specifying a BigQuery
mode for fields (mode will always be set to 'NULLABLE').
create_disposition: A string describing what happens if the table does not
exist. Possible values are:
- BigQueryDisposition.CREATE_IF_NEEDED: create if does not exist.
- BigQueryDisposition.CREATE_NEVER: fail the write if does not exist.
write_disposition: A string describing what happens if the table has
already some data. Possible values are:
- BigQueryDisposition.WRITE_TRUNCATE: delete existing rows.
- BigQueryDisposition.WRITE_APPEND: add to existing rows.
- BigQueryDisposition.WRITE_EMPTY: fail the write if table not empty.
For streaming pipelines WriteTruncate can not be used.
kms_key: Optional Cloud KMS key name for use when creating new tables.
test_client: Override the default bigquery client used for testing.
max_buffered_rows: The maximum number of rows that are allowed to stay
buffered when running dynamic destinations. When destinations are
dynamic, it is important to keep caches small even when a single
batch has not been completely filled up.
retry_strategy: The strategy to use when retrying streaming inserts
into BigQuery. Options are shown in bigquery_tools.RetryStrategy attrs.
additional_bq_parameters (dict, callable): A set of additional parameters
to be passed when creating a BigQuery table. These are passed when
triggering a load job for FILE_LOADS, and when creating a new table for
STREAMING_INSERTS.
ignore_insert_ids: When using the STREAMING_INSERTS method to write data
to BigQuery, `insert_ids` are a feature of BigQuery that support
deduplication of events. If your use case is not sensitive to
duplication of data inserted to BigQuery, set `ignore_insert_ids`
to True to increase the throughput for BQ writing. See:
https://cloud.google.com/bigquery/streaming-data-into-bigquery#disabling_best_effort_de-duplication
with_batched_input: Whether the input has already been batched per
destination. If not, perform best-effort batching per destination within
a bundle.
ignore_unknown_columns: Accept rows that contain values that do not match
the schema. The unknown values are ignored. Default is False,
which treats unknown values as errors. See reference:
https://cloud.google.com/bigquery/docs/reference/rest/v2/tabledata/insertAll
max_retries: The number of times that we will retry inserting a group of
rows into BigQuery. By default, we retry 10000 times with exponential
backoffs (effectively retry forever).
max_insert_payload_size: The maximum byte size for a BigQuery legacy
streaming insert payload.
"""
self.schema = schema
self.test_client = test_client
self.create_disposition = create_disposition
self.write_disposition = write_disposition
if write_disposition in (BigQueryDisposition.WRITE_EMPTY,
BigQueryDisposition.WRITE_TRUNCATE):
raise ValueError(
'Write disposition %s is not supported for'
' streaming inserts to BigQuery' % write_disposition)
self._rows_buffer = []
self._reset_rows_buffer()
self._total_buffered_rows = 0
self.kms_key = kms_key
self._max_batch_size = batch_size or BigQueryWriteFn.DEFAULT_MAX_BATCH_SIZE
self._max_buffered_rows = (
max_buffered_rows or BigQueryWriteFn.DEFAULT_MAX_BUFFERED_ROWS)
self._retry_strategy = retry_strategy or RetryStrategy.RETRY_ALWAYS
self.ignore_insert_ids = ignore_insert_ids
self.with_batched_input = with_batched_input
self.additional_bq_parameters = additional_bq_parameters or {}
# accumulate the total time spent in exponential backoff
self._throttled_secs = Metrics.counter(
BigQueryWriteFn, "cumulativeThrottlingSeconds")
self.batch_size_metric = Metrics.distribution(self.__class__, "batch_size")
self.batch_latency_metric = Metrics.distribution(
self.__class__, "batch_latency_ms")
self.failed_rows_metric = Metrics.distribution(
self.__class__, "rows_failed_per_batch")
self.bigquery_wrapper = None
self.streaming_api_logging_frequency_sec = (
BigQueryWriteFn.STREAMING_API_LOGGING_FREQUENCY_SEC)
self.ignore_unknown_columns = ignore_unknown_columns
self._max_retries = max_retries
self._max_insert_payload_size = max_insert_payload_size
def display_data(self):
return {
'max_batch_size': self._max_batch_size,
'max_buffered_rows': self._max_buffered_rows,
'retry_strategy': self._retry_strategy,
'create_disposition': str(self.create_disposition),
'write_disposition': str(self.write_disposition),
'additional_bq_parameters': str(self.additional_bq_parameters),
'ignore_insert_ids': str(self.ignore_insert_ids),
'ignore_unknown_columns': str(self.ignore_unknown_columns)
}
def _reset_rows_buffer(self):
self._rows_buffer = collections.defaultdict(lambda: [])
self._destination_buffer_byte_size = collections.defaultdict(lambda: 0)
@staticmethod
def get_table_schema(schema):
"""Transform the table schema into a bigquery.TableSchema instance.
Args:
schema: The schema to be used if the BigQuery table to write has to be
created. This is a dictionary object created in the WriteToBigQuery
transform.
Returns:
table_schema: The schema to be used if the BigQuery table to write has
to be created but in the bigquery.TableSchema format.
"""
if schema is None:
return schema
elif isinstance(schema, str):
return bigquery_tools.parse_table_schema_from_json(schema)
elif isinstance(schema, dict):
return bigquery_tools.parse_table_schema_from_json(json.dumps(schema))
else:
raise TypeError('Unexpected schema argument: %s.' % schema)
def start_bundle(self):
self._reset_rows_buffer()
if not self.bigquery_wrapper:
self.bigquery_wrapper = bigquery_tools.BigQueryWrapper(
client=self.test_client)
(
bigquery_tools.BigQueryWrapper.HISTOGRAM_METRIC_LOGGER.
minimum_logging_frequency_msec
) = self.streaming_api_logging_frequency_sec * 1000
self._backoff_calculator = iter(
retry.FuzzedExponentialIntervals(
initial_delay_secs=0.2,
num_retries=self._max_retries,
max_delay_secs=1500))
def _create_table_if_needed(self, table_reference, schema=None):
str_table_reference = '%s:%s.%s' % (
table_reference.projectId,
table_reference.datasetId,
table_reference.tableId)
if str_table_reference in _KNOWN_TABLES:
return
if self.create_disposition == BigQueryDisposition.CREATE_NEVER:
# If we never want to create the table, we assume it already exists,
# and avoid the get-or-create step.
return
_LOGGER.debug(
'Creating or getting table %s with schema %s.', table_reference, schema)
table_schema = self.get_table_schema(schema)
if table_reference.projectId is None:
table_reference.projectId = vp.RuntimeValueProvider.get_value(
'project', str, '')
self.bigquery_wrapper.get_or_create_table(
table_reference.projectId,
table_reference.datasetId,
table_reference.tableId,
table_schema,
self.create_disposition,
self.write_disposition,
additional_create_parameters=self.additional_bq_parameters)
_KNOWN_TABLES.add(str_table_reference)
def process(self, element, *schema_side_inputs):
destination = bigquery_tools.get_hashable_destination(element[0])
if callable(self.schema):
schema = self.schema(destination, *schema_side_inputs)
elif isinstance(self.schema, vp.ValueProvider):
schema = self.schema.get()
else:
schema = self.schema
self._create_table_if_needed(
bigquery_tools.parse_table_reference(destination), schema)
if not self.with_batched_input:
row_and_insert_id = element[1]
row_byte_size = get_deep_size(row_and_insert_id)
# send large rows that exceed BigQuery insert limits to DLQ
if row_byte_size >= self._max_insert_payload_size:
row_mb_size = row_byte_size / 1_000_000
max_mb_size = self._max_insert_payload_size / 1_000_000
error = (
f"Received row with size {row_mb_size}MB that exceeds "
f"the maximum insert payload size set ({max_mb_size}MB).")
return [
pvalue.TaggedOutput(
BigQueryWriteFn.FAILED_ROWS_WITH_ERRORS,
GlobalWindows.windowed_value(
(destination, row_and_insert_id[0], error))),
pvalue.TaggedOutput(
BigQueryWriteFn.FAILED_ROWS,
GlobalWindows.windowed_value(
(destination, row_and_insert_id[0])))
]
# Flush current batch first if adding this row will exceed our limits
# limits: byte size; number of rows
if ((self._destination_buffer_byte_size[destination] + row_byte_size >
self._max_insert_payload_size) or
len(self._rows_buffer[destination]) >= self._max_batch_size):
flushed_batch = self._flush_batch(destination)
# After flushing our existing batch, we now buffer the current row
# for the next flush
self._rows_buffer[destination].append(row_and_insert_id)
self._destination_buffer_byte_size[destination] = row_byte_size
return flushed_batch
self._rows_buffer[destination].append(row_and_insert_id)
self._destination_buffer_byte_size[destination] += row_byte_size
self._total_buffered_rows += 1
if self._total_buffered_rows >= self._max_buffered_rows:
return self._flush_all_batches()
else:
# The input is already batched per destination, flush the rows now.
batched_rows = element[1]
self._rows_buffer[destination].extend(batched_rows)
return self._flush_batch(destination)
def finish_bundle(self):
bigquery_tools.BigQueryWrapper.HISTOGRAM_METRIC_LOGGER.log_metrics(
reset_after_logging=True)
return self._flush_all_batches()
def _flush_all_batches(self):
_LOGGER.debug(
'Attempting to flush to all destinations. Total buffered: %s',
self._total_buffered_rows)
return itertools.chain(
*[
self._flush_batch(destination)
for destination in list(self._rows_buffer.keys())
if self._rows_buffer[destination]
])
def _flush_batch(self, destination):
# Flush the current batch of rows to BigQuery.
rows_and_insert_ids = self._rows_buffer[destination]
table_reference = bigquery_tools.parse_table_reference(destination)
if table_reference.projectId is None:
table_reference.projectId = vp.RuntimeValueProvider.get_value(
'project', str, '')
_LOGGER.debug(
'Flushing data to %s. Total %s rows.',
destination,
len(rows_and_insert_ids))
self.batch_size_metric.update(len(rows_and_insert_ids))
rows = [r[0] for r in rows_and_insert_ids]
if self.ignore_insert_ids:
insert_ids = [None for r in rows_and_insert_ids]
else:
insert_ids = [r[1] for r in rows_and_insert_ids]
while True:
start = time.time()
passed, errors = self.bigquery_wrapper.insert_rows(
project_id=table_reference.projectId,
dataset_id=table_reference.datasetId,
table_id=table_reference.tableId,
rows=rows,
insert_ids=insert_ids,
skip_invalid_rows=True,
ignore_unknown_values=self.ignore_unknown_columns)
self.batch_latency_metric.update((time.time() - start) * 1000)
failed_rows = [(rows[entry['index']], entry["errors"])
for entry in errors]
retry_backoff = next(self._backoff_calculator, None)
# If retry_backoff is None, then we will not retry and must log.
should_retry = any(
RetryStrategy.should_retry(
self._retry_strategy, entry['errors'][0]['reason'])
for entry in errors) and retry_backoff is not None
if not passed:
self.failed_rows_metric.update(len(failed_rows))
message = (
'There were errors inserting to BigQuery. Will{} retry. '
'Errors were {}'.format(("" if should_retry else " not"), errors))
# The log level is:
# - WARNING when we are continuing to retry, and have a deadline.
# - ERROR when we will no longer retry, or MAY retry forever.
log_level = (
logging.WARN if should_retry or
self._retry_strategy != RetryStrategy.RETRY_ALWAYS else
logging.ERROR)
_LOGGER.log(log_level, message)
if not should_retry:
break
else:
_LOGGER.info(
'Sleeping %s seconds before retrying insertion.', retry_backoff)
time.sleep(retry_backoff)
rows = [fr[0] for fr in failed_rows]
self._throttled_secs.inc(retry_backoff)
self._total_buffered_rows -= len(self._rows_buffer[destination])
del self._rows_buffer[destination]
if destination in self._destination_buffer_byte_size:
del self._destination_buffer_byte_size[destination]
return itertools.chain([
pvalue.TaggedOutput(
BigQueryWriteFn.FAILED_ROWS_WITH_ERRORS,
GlobalWindows.windowed_value((destination, row, err))) for row,
err in failed_rows
],
[
pvalue.TaggedOutput(
BigQueryWriteFn.FAILED_ROWS,
GlobalWindows.windowed_value(
(destination, row))) for row,
unused_err in failed_rows
])
# The number of shards per destination when writing via streaming inserts.
DEFAULT_SHARDS_PER_DESTINATION = 500
# The max duration a batch of elements is allowed to be buffered before being
# flushed to BigQuery.
DEFAULT_BATCH_BUFFERING_DURATION_LIMIT_SEC = 0.2
class _StreamToBigQuery(PTransform):
def __init__(
self,
table_reference,
table_side_inputs,
schema_side_inputs,
schema,
batch_size,
triggering_frequency,
create_disposition,
write_disposition,
kms_key,
retry_strategy,
additional_bq_parameters,
ignore_insert_ids,
ignore_unknown_columns,
with_auto_sharding,
num_streaming_keys=DEFAULT_SHARDS_PER_DESTINATION,
test_client=None,
max_retries=None,
max_insert_payload_size=MAX_INSERT_PAYLOAD_SIZE):
self.table_reference = table_reference
self.table_side_inputs = table_side_inputs
self.schema_side_inputs = schema_side_inputs
self.schema = schema
self.batch_size = batch_size
self.triggering_frequency = triggering_frequency
self.create_disposition = create_disposition
self.write_disposition = write_disposition
self.kms_key = kms_key
self.retry_strategy = retry_strategy
self.test_client = test_client
self.additional_bq_parameters = additional_bq_parameters
self.ignore_insert_ids = ignore_insert_ids
self.ignore_unknown_columns = ignore_unknown_columns
self.with_auto_sharding = with_auto_sharding
self._num_streaming_keys = num_streaming_keys
self.max_retries = max_retries or MAX_INSERT_RETRIES
self._max_insert_payload_size = max_insert_payload_size
class InsertIdPrefixFn(DoFn):
def start_bundle(self):
self.prefix = str(uuid.uuid4())
self._row_count = 0
def process(self, element):
key = element[0]
value = element[1]
insert_id = '%s-%s' % (self.prefix, self._row_count)
self._row_count += 1
yield (key, (value, insert_id))
def expand(self, input):
bigquery_write_fn = BigQueryWriteFn(
schema=self.schema,
batch_size=self.batch_size,
create_disposition=self.create_disposition,
write_disposition=self.write_disposition,
kms_key=self.kms_key,
retry_strategy=self.retry_strategy,
test_client=self.test_client,
additional_bq_parameters=self.additional_bq_parameters,
ignore_insert_ids=self.ignore_insert_ids,
ignore_unknown_columns=self.ignore_unknown_columns,
with_batched_input=self.with_auto_sharding,
max_retries=self.max_retries,
max_insert_payload_size=self._max_insert_payload_size)
def _add_random_shard(element):
key = element[0]
value = element[1]
return ((key, random.randint(0, self._num_streaming_keys)), value)
def _restore_table_ref(sharded_table_ref_elems_kv):
sharded_table_ref = sharded_table_ref_elems_kv[0]
table_ref = bigquery_tools.parse_table_reference(sharded_table_ref)
return (table_ref, sharded_table_ref_elems_kv[1])
tagged_data = (
input
| 'AppendDestination' >> beam.ParDo(
bigquery_tools.AppendDestinationsFn(self.table_reference),
*self.table_side_inputs)
| 'AddInsertIds' >> beam.ParDo(_StreamToBigQuery.InsertIdPrefixFn())
|
'ToHashableTableRef' >> beam.Map(bigquery_tools.to_hashable_table_ref))
if not self.with_auto_sharding:
tagged_data = (
tagged_data
| 'WithFixedSharding' >> beam.Map(_add_random_shard)
| 'CommitInsertIds' >> ReshufflePerKey()
| 'DropShard' >> beam.Map(lambda kv: (kv[0][0], kv[1])))
else:
# Auto-sharding is achieved via GroupIntoBatches.WithShardedKey
# transform which shards, groups and at the same time batches the table
# rows to be inserted to BigQuery.
# Firstly the keys of tagged_data (table references) are converted to a
# hashable format. This is needed to work with the keyed states used by
# GroupIntoBatches. After grouping and batching is done, original table
# references are restored.
tagged_data = (
tagged_data
| 'WithAutoSharding' >> beam.GroupIntoBatches.WithShardedKey(
(self.batch_size or BigQueryWriteFn.DEFAULT_MAX_BUFFERED_ROWS),
self.triggering_frequency or
DEFAULT_BATCH_BUFFERING_DURATION_LIMIT_SEC)
| 'DropShard' >> beam.Map(lambda kv: (kv[0].key, kv[1])))
return (
tagged_data
| 'FromHashableTableRef' >> beam.Map(_restore_table_ref)
| 'StreamInsertRows' >> ParDo(
bigquery_write_fn, *self.schema_side_inputs).with_outputs(
BigQueryWriteFn.FAILED_ROWS,
BigQueryWriteFn.FAILED_ROWS_WITH_ERRORS,
main='main'))
# Flag to be passed to WriteToBigQuery to force schema autodetection
SCHEMA_AUTODETECT = 'SCHEMA_AUTODETECT'
[docs]class WriteToBigQuery(PTransform):
"""Write data to BigQuery.
This transform receives a PCollection of elements to be inserted into BigQuery
tables. The elements would come in as Python dictionaries, or as `TableRow`
instances.
"""
[docs] class Method(object):
DEFAULT = 'DEFAULT'
STREAMING_INSERTS = 'STREAMING_INSERTS'
FILE_LOADS = 'FILE_LOADS'
STORAGE_WRITE_API = 'STORAGE_WRITE_API'
def __init__(
self,
table,
dataset=None,
project=None,
schema=None,
create_disposition=BigQueryDisposition.CREATE_IF_NEEDED,
write_disposition=BigQueryDisposition.WRITE_APPEND,
kms_key=None,
batch_size=None,
max_file_size=None,
max_partition_size=None,
max_files_per_bundle=None,
test_client=None,
custom_gcs_temp_location=None,
method=None,
insert_retry_strategy=None,
additional_bq_parameters=None,
table_side_inputs=None,
schema_side_inputs=None,
triggering_frequency=None,
use_at_least_once=False,
validate=True,
temp_file_format=None,
ignore_insert_ids=False,
# TODO(https://github.com/apache/beam/issues/20712): Switch the default
# when the feature is mature.
with_auto_sharding=False,
num_storage_api_streams=0,
ignore_unknown_columns=False,
load_job_project_id=None,
max_insert_payload_size=MAX_INSERT_PAYLOAD_SIZE,
num_streaming_keys=DEFAULT_SHARDS_PER_DESTINATION,
expansion_service=None):
"""Initialize a WriteToBigQuery transform.
Args:
table (str, callable, ValueProvider): The ID of the table, or a callable
that returns it. The ID must contain only letters ``a-z``, ``A-Z``,
numbers ``0-9``, or connectors ``-_``. If dataset argument is
:data:`None` then the table argument must contain the entire table
reference specified as: ``'DATASET.TABLE'``
or ``'PROJECT:DATASET.TABLE'``. If it's a callable, it must receive one
argument representing an element to be written to BigQuery, and return
a TableReference, or a string table name as specified above.
dataset (str): The ID of the dataset containing this table or
:data:`None` if the table reference is specified entirely by the table
argument.
project (str): The ID of the project containing this table or
:data:`None` if the table reference is specified entirely by the table
argument.
schema (str,dict,ValueProvider,callable): The schema to be used if the
BigQuery table to write has to be created. This can be either specified
as a :class:`~apache_beam.io.gcp.internal.clients.bigquery.\
bigquery_v2_messages.TableSchema`. or a `ValueProvider` that has a JSON string,
or a python dictionary, or the string or dictionary itself,
object or a single string of the form
``'field1:type1,field2:type2,field3:type3'`` that defines a comma
separated list of fields. Here ``'type'`` should specify the BigQuery
type of the field. Single string based schemas do not support nested
fields, repeated fields, or specifying a BigQuery mode for fields
(mode will always be set to ``'NULLABLE'``).
If a callable, then it should receive a destination (in the form of
a str, and return a str, dict or TableSchema).
One may also pass ``SCHEMA_AUTODETECT`` here when using JSON-based
file loads, and BigQuery will try to infer the schema for the files
that are being loaded.
create_disposition (BigQueryDisposition): A string describing what
happens if the table does not exist. Possible values are:
* :attr:`BigQueryDisposition.CREATE_IF_NEEDED`: create if does not
exist.
* :attr:`BigQueryDisposition.CREATE_NEVER`: fail the write if does not
exist.
write_disposition (BigQueryDisposition): A string describing what happens
if the table has already some data. Possible values are:
* :attr:`BigQueryDisposition.WRITE_TRUNCATE`: delete existing rows.
* :attr:`BigQueryDisposition.WRITE_APPEND`: add to existing rows.
* :attr:`BigQueryDisposition.WRITE_EMPTY`: fail the write if table not
empty.
For streaming pipelines WriteTruncate can not be used.
kms_key (str): Optional Cloud KMS key name for use when creating new
tables.
batch_size (int): Number of rows to be written to BQ per streaming API
insert. The default is 500.
test_client: Override the default bigquery client used for testing.
max_file_size (int): The maximum size for a file to be written and then
loaded into BigQuery. The default value is 4TB, which is 80% of the
limit of 5TB for BigQuery to load any file.
max_partition_size (int): Maximum byte size for each load job to
BigQuery. Defaults to 15TB. Applicable to FILE_LOADS only.
max_files_per_bundle(int): The maximum number of files to be concurrently
written by a worker. The default here is 20. Larger values will allow
writing to multiple destinations without having to reshard - but they
increase the memory burden on the workers.
custom_gcs_temp_location (str): A GCS location to store files to be used
for file loads into BigQuery. By default, this will use the pipeline's
temp_location, but for pipelines whose temp_location is not appropriate
for BQ File Loads, users should pass a specific one.
method: The method to use to write to BigQuery. It may be
STREAMING_INSERTS, FILE_LOADS, STORAGE_WRITE_API or DEFAULT. An
introduction on loading data to BigQuery:
https://cloud.google.com/bigquery/docs/loading-data.
DEFAULT will use STREAMING_INSERTS on Streaming pipelines and
FILE_LOADS on Batch pipelines.
Note: FILE_LOADS currently does not support BigQuery's JSON data type:
https://cloud.google.com/bigquery/docs/reference/standard-sql/data-types#json_type">
insert_retry_strategy: The strategy to use when retrying streaming inserts
into BigQuery. Options are shown in bigquery_tools.RetryStrategy attrs.
Default is to retry always. This means that whenever there are rows
that fail to be inserted to BigQuery, they will be retried indefinitely.
Other retry strategy settings will produce a deadletter PCollection
as output. Appropriate values are:
* `RetryStrategy.RETRY_ALWAYS`: retry all rows if
there are any kind of errors. Note that this will hold your pipeline
back if there are errors until you cancel or update it.
* `RetryStrategy.RETRY_NEVER`: rows with errors
will not be retried. Instead they will be output to a dead letter
queue under the `'FailedRows'` tag.
* `RetryStrategy.RETRY_ON_TRANSIENT_ERROR`: retry
rows with transient errors (e.g. timeouts). Rows with permanent errors
will be output to dead letter queue under `'FailedRows'` tag.
additional_bq_parameters (dict, callable): Additional parameters to pass
to BQ when creating / loading data into a table. If a callable, it
should be a function that receives a table reference indicating
the destination and returns a dictionary.
These can be 'timePartitioning', 'clustering', etc. They are passed
directly to the job load configuration. See
https://cloud.google.com/bigquery/docs/reference/rest/v2/Job#jobconfigurationload
table_side_inputs (tuple): A tuple with ``AsSideInput`` PCollections to be
passed to the table callable (if one is provided).
schema_side_inputs: A tuple with ``AsSideInput`` PCollections to be
passed to the schema callable (if one is provided).
triggering_frequency (float):
When method is FILE_LOADS:
Value will be converted to int. Every triggering_frequency seconds, a
BigQuery load job will be triggered for all the data written since the
last load job. BigQuery has limits on how many load jobs can be
triggered per day, so be careful not to set this duration too low, or
you may exceed daily quota. Often this is set to 5 or 10 minutes to
ensure that the project stays well under the BigQuery quota. See
https://cloud.google.com/bigquery/quota-policy for more information
about BigQuery quotas.
When method is STREAMING_INSERTS and with_auto_sharding=True:
A streaming inserts batch will be submitted at least every
triggering_frequency seconds when data is waiting. The batch can be
sent earlier if it reaches the maximum batch size set by batch_size.
Default value is 0.2 seconds.
When method is STORAGE_WRITE_API:
A stream of rows will be committed every triggering_frequency seconds.
By default, this will be 5 seconds to ensure exactly-once semantics.
use_at_least_once: Intended only for STORAGE_WRITE_API. When True, will
use at-least-once semantics. This is cheaper and provides lower
latency, but will potentially duplicate records.
validate: Indicates whether to perform validation checks on
inputs. This parameter is primarily used for testing.
temp_file_format: The format to use for file loads into BigQuery. The
options are NEWLINE_DELIMITED_JSON or AVRO, with NEWLINE_DELIMITED_JSON
being used by default. For advantages and limitations of the two
formats, see
https://cloud.google.com/bigquery/docs/loading-data-cloud-storage-avro
and
https://cloud.google.com/bigquery/docs/loading-data-cloud-storage-json.
ignore_insert_ids: When using the STREAMING_INSERTS method to write data
to BigQuery, `insert_ids` are a feature of BigQuery that support
deduplication of events. If your use case is not sensitive to
duplication of data inserted to BigQuery, set `ignore_insert_ids`
to True to increase the throughput for BQ writing. See:
https://cloud.google.com/bigquery/streaming-data-into-bigquery#disabling_best_effort_de-duplication
with_auto_sharding: Experimental. If true, enables using a dynamically
determined number of shards to write to BigQuery. This can be used for
all of FILE_LOADS, STREAMING_INSERTS, and STORAGE_WRITE_API. Only
applicable to unbounded input.
num_storage_api_streams: Specifies the number of write streams that the
Storage API sink will use. This parameter is only applicable when
writing unbounded data.
ignore_unknown_columns: Accept rows that contain values that do not match
the schema. The unknown values are ignored. Default is False,
which treats unknown values as errors. This option is only valid for
method=STREAMING_INSERTS. See reference:
https://cloud.google.com/bigquery/docs/reference/rest/v2/tabledata/insertAll
load_job_project_id: Specifies an alternate GCP project id to use for
billingBatch File Loads. By default, the project id of the table is
used.
num_streaming_keys: The number of shards per destination when writing via
streaming inserts.
expansion_service: The address (host:port) of the expansion service.
If no expansion service is provided, will attempt to run the default
GCP expansion service. Used for STORAGE_WRITE_API method.
max_insert_payload_size: The maximum byte size for a BigQuery legacy
streaming insert payload.
"""
self._table = table
self._dataset = dataset
self._project = project
self.table_reference = bigquery_tools.parse_table_reference(
table, dataset, project)
self.create_disposition = BigQueryDisposition.validate_create(
create_disposition)
self.write_disposition = BigQueryDisposition.validate_write(
write_disposition)
if schema == SCHEMA_AUTODETECT:
self.schema = schema
else:
self.schema = bigquery_tools.get_dict_table_schema(schema)
self.batch_size = batch_size
self.kms_key = kms_key
self.test_client = test_client
# TODO(pabloem): Consider handling ValueProvider for this location.
self.custom_gcs_temp_location = custom_gcs_temp_location
self.max_file_size = max_file_size
self.max_partition_size = max_partition_size
self.max_files_per_bundle = max_files_per_bundle
self.method = method or WriteToBigQuery.Method.DEFAULT
self.triggering_frequency = triggering_frequency
self.use_at_least_once = use_at_least_once
self.expansion_service = expansion_service
self.with_auto_sharding = with_auto_sharding
self._num_storage_api_streams = num_storage_api_streams
self.insert_retry_strategy = insert_retry_strategy
self._validate = validate
self._temp_file_format = temp_file_format or bigquery_tools.FileFormat.JSON
self.additional_bq_parameters = additional_bq_parameters or {}
self.table_side_inputs = table_side_inputs or ()
self.schema_side_inputs = schema_side_inputs or ()
self._ignore_insert_ids = ignore_insert_ids
self._ignore_unknown_columns = ignore_unknown_columns
self.load_job_project_id = load_job_project_id
self._max_insert_payload_size = max_insert_payload_size
self._num_streaming_keys = num_streaming_keys
# Dict/schema methods were moved to bigquery_tools, but keep references
# here for backward compatibility.
get_table_schema_from_string = \
staticmethod(bigquery_tools.get_table_schema_from_string)
table_schema_to_dict = staticmethod(bigquery_tools.table_schema_to_dict)
get_dict_table_schema = staticmethod(bigquery_tools.get_dict_table_schema)
def _compute_method(self, experiments, is_streaming_pipeline):
# If the new BQ sink is not activated for experiment flags, then we use
# streaming inserts by default (it gets overridden in dataflow_runner.py).
if self.method == self.Method.DEFAULT and is_streaming_pipeline:
return self.Method.STREAMING_INSERTS
elif self.method == self.Method.DEFAULT and not is_streaming_pipeline:
return self.Method.FILE_LOADS
else:
return self.method
[docs] def expand(self, pcoll):
p = pcoll.pipeline
if (isinstance(self.table_reference, TableReference) and
self.table_reference.projectId is None):
self.table_reference.projectId = pcoll.pipeline.options.view_as(
GoogleCloudOptions).project
# TODO(pabloem): Use a different method to determine if streaming or batch.
is_streaming_pipeline = p.options.view_as(StandardOptions).streaming
if not is_streaming_pipeline and self.with_auto_sharding:
raise ValueError(
'with_auto_sharding is not applicable to batch pipelines.')
experiments = p.options.view_as(DebugOptions).experiments or []
method_to_use = self._compute_method(experiments, is_streaming_pipeline)
if method_to_use == WriteToBigQuery.Method.STREAMING_INSERTS:
if self.schema == SCHEMA_AUTODETECT:
raise ValueError(
'Schema auto-detection is not supported for streaming '
'inserts into BigQuery. Only for File Loads.')
if self.triggering_frequency is not None and not self.with_auto_sharding:
raise ValueError(
'triggering_frequency with STREAMING_INSERTS can only be used with '
'with_auto_sharding=True.')
if self._max_insert_payload_size > MAX_INSERT_PAYLOAD_SIZE:
raise ValueError(
'max_insert_payload_size can only go up to '
f'{MAX_INSERT_PAYLOAD_SIZE} bytes, as per BigQuery quota limits: '
'https://cloud.google.com/bigquery/quotas#streaming_inserts.')
outputs = pcoll | _StreamToBigQuery(
table_reference=self.table_reference,
table_side_inputs=self.table_side_inputs,
schema_side_inputs=self.schema_side_inputs,
schema=self.schema,
batch_size=self.batch_size,
triggering_frequency=self.triggering_frequency,
create_disposition=self.create_disposition,
write_disposition=self.write_disposition,
kms_key=self.kms_key,
retry_strategy=self.insert_retry_strategy,
additional_bq_parameters=self.additional_bq_parameters,
ignore_insert_ids=self._ignore_insert_ids,
ignore_unknown_columns=self._ignore_unknown_columns,
with_auto_sharding=self.with_auto_sharding,
test_client=self.test_client,
max_insert_payload_size=self._max_insert_payload_size,
num_streaming_keys=self._num_streaming_keys)
return WriteResult(
method=WriteToBigQuery.Method.STREAMING_INSERTS,
failed_rows=outputs[BigQueryWriteFn.FAILED_ROWS],
failed_rows_with_errors=outputs[
BigQueryWriteFn.FAILED_ROWS_WITH_ERRORS])
elif method_to_use == WriteToBigQuery.Method.FILE_LOADS:
if self._temp_file_format == bigquery_tools.FileFormat.AVRO:
if self.schema == SCHEMA_AUTODETECT:
raise ValueError(
'Schema auto-detection is not supported when using Avro based '
'file loads into BigQuery. Please specify a schema or set '
'temp_file_format="NEWLINE_DELIMITED_JSON"')
if self.schema is None:
raise ValueError(
'A schema must be provided when writing to BigQuery using '
'Avro based file loads')
if self.schema and type(self.schema) is dict:
def find_in_nested_dict(schema):
for field in schema['fields']:
if field['type'] == 'JSON':
logging.warning(
'Found JSON type in TableSchema for "File_LOADS" write '
'method. Make sure the TableSchema field is a parsed '
'JSON to ensure the read as a JSON type. Otherwise it '
'will read as a raw (escaped) string.')
elif field['type'] == 'STRUCT':
find_in_nested_dict(field)
find_in_nested_dict(self.schema)
from apache_beam.io.gcp.bigquery_file_loads import BigQueryBatchFileLoads
# Only cast to int when a value is given.
# We only use an int for BigQueryBatchFileLoads
if self.triggering_frequency is not None:
triggering_frequency = int(self.triggering_frequency)
else:
triggering_frequency = self.triggering_frequency
output = pcoll | BigQueryBatchFileLoads(
destination=self.table_reference,
schema=self.schema,
project=self._project,
create_disposition=self.create_disposition,
write_disposition=self.write_disposition,
triggering_frequency=triggering_frequency,
with_auto_sharding=self.with_auto_sharding,
temp_file_format=self._temp_file_format,
max_file_size=self.max_file_size,
max_partition_size=self.max_partition_size,
max_files_per_bundle=self.max_files_per_bundle,
custom_gcs_temp_location=self.custom_gcs_temp_location,
test_client=self.test_client,
table_side_inputs=self.table_side_inputs,
schema_side_inputs=self.schema_side_inputs,
additional_bq_parameters=self.additional_bq_parameters,
validate=self._validate,
is_streaming_pipeline=is_streaming_pipeline,
load_job_project_id=self.load_job_project_id)
return WriteResult(
method=WriteToBigQuery.Method.FILE_LOADS,
destination_load_jobid_pairs=output[
BigQueryBatchFileLoads.DESTINATION_JOBID_PAIRS],
destination_file_pairs=output[
BigQueryBatchFileLoads.DESTINATION_FILE_PAIRS],
destination_copy_jobid_pairs=output[
BigQueryBatchFileLoads.DESTINATION_COPY_JOBID_PAIRS])
elif method_to_use == WriteToBigQuery.Method.STORAGE_WRITE_API:
return pcoll | StorageWriteToBigQuery(
table=self.table_reference,
schema=self.schema,
table_side_inputs=self.table_side_inputs,
create_disposition=self.create_disposition,
write_disposition=self.write_disposition,
triggering_frequency=self.triggering_frequency,
use_at_least_once=self.use_at_least_once,
with_auto_sharding=self.with_auto_sharding,
num_storage_api_streams=self._num_storage_api_streams,
expansion_service=self.expansion_service)
else:
raise ValueError(f"Unsupported method {method_to_use}")
[docs] def display_data(self):
res = {}
if self.table_reference is not None and isinstance(self.table_reference,
TableReference):
tableSpec = '{}.{}'.format(
self.table_reference.datasetId, self.table_reference.tableId)
if self.table_reference.projectId is not None:
tableSpec = '{}:{}'.format(self.table_reference.projectId, tableSpec)
res['table'] = DisplayDataItem(tableSpec, label='Table')
res['validation'] = DisplayDataItem(
self._validate, label="Validation Enabled")
return res
[docs] def to_runner_api_parameter(self, context):
from apache_beam.internal import pickler
# It'd be nice to name these according to their actual
# names/positions in the orignal argument list, but such a
# transformation is currently irreversible given how
# remove_objects_from_args and insert_values_in_args
# are currently implemented.
def serialize(side_inputs):
return {(SIDE_INPUT_PREFIX + '%s') % ix:
si.to_runner_api(context).SerializeToString()
for ix,
si in enumerate(side_inputs)}
table_side_inputs = serialize(self.table_side_inputs)
schema_side_inputs = serialize(self.schema_side_inputs)
config = {
'table': self._table,
'dataset': self._dataset,
'project': self._project,
'schema': self.schema,
'create_disposition': self.create_disposition,
'write_disposition': self.write_disposition,
'kms_key': self.kms_key,
'batch_size': self.batch_size,
'max_file_size': self.max_file_size,
'max_files_per_bundle': self.max_files_per_bundle,
'custom_gcs_temp_location': self.custom_gcs_temp_location,
'method': self.method,
'insert_retry_strategy': self.insert_retry_strategy,
'additional_bq_parameters': self.additional_bq_parameters,
'table_side_inputs': table_side_inputs,
'schema_side_inputs': schema_side_inputs,
'triggering_frequency': self.triggering_frequency,
'validate': self._validate,
'temp_file_format': self._temp_file_format,
'ignore_insert_ids': self._ignore_insert_ids,
'with_auto_sharding': self.with_auto_sharding,
}
return 'beam:transform:write_to_big_query:v0', pickler.dumps(config)
[docs] @PTransform.register_urn('beam:transform:write_to_big_query:v0', bytes)
def from_runner_api(unused_ptransform, payload, context):
from apache_beam.internal import pickler
from apache_beam.portability.api import beam_runner_api_pb2
config = pickler.loads(payload)
def deserialize(side_inputs):
deserialized_side_inputs = {}
for k, v in side_inputs.items():
side_input = beam_runner_api_pb2.SideInput()
side_input.ParseFromString(v)
deserialized_side_inputs[k] = side_input
# This is an ordered list stored as a dict (see the comments in
# to_runner_api_parameter above).
indexed_side_inputs = [(
get_sideinput_index(tag),
pvalue.AsSideInput.from_runner_api(si, context)) for tag,
si in deserialized_side_inputs.items()]
return [si for _, si in sorted(indexed_side_inputs)]
config['table_side_inputs'] = deserialize(config['table_side_inputs'])
config['schema_side_inputs'] = deserialize(config['schema_side_inputs'])
return WriteToBigQuery(**config)
[docs]class WriteResult:
"""The result of a WriteToBigQuery transform.
"""
def __init__(
self,
method: str = None,
destination_load_jobid_pairs: PCollection[Tuple[str,
JobReference]] = None,
destination_file_pairs: PCollection[Tuple[str, Tuple[str, int]]] = None,
destination_copy_jobid_pairs: PCollection[Tuple[str,
JobReference]] = None,
failed_rows: PCollection[Tuple[str, dict]] = None,
failed_rows_with_errors: PCollection[Tuple[str, dict, list]] = None):
self._method = method
self._destination_load_jobid_pairs = destination_load_jobid_pairs
self._destination_file_pairs = destination_file_pairs
self._destination_copy_jobid_pairs = destination_copy_jobid_pairs
self._failed_rows = failed_rows
self._failed_rows_with_errors = failed_rows_with_errors
from apache_beam.io.gcp.bigquery_file_loads import BigQueryBatchFileLoads
self.attributes = {
BigQueryWriteFn.FAILED_ROWS: WriteResult.failed_rows,
BigQueryWriteFn.FAILED_ROWS_WITH_ERRORS: WriteResult.
failed_rows_with_errors,
BigQueryBatchFileLoads.DESTINATION_JOBID_PAIRS: WriteResult.
destination_load_jobid_pairs,
BigQueryBatchFileLoads.DESTINATION_FILE_PAIRS: WriteResult.
destination_file_pairs,
BigQueryBatchFileLoads.DESTINATION_COPY_JOBID_PAIRS: WriteResult.
destination_copy_jobid_pairs,
}
[docs] def validate(self, valid_methods, attribute):
if self._method not in valid_methods:
raise AttributeError(
f'Cannot get {attribute} because it is not produced '
f'by the {self._method} write method. Note: only '
f'{valid_methods} produces this attribute.')
@property
def destination_load_jobid_pairs(
self) -> PCollection[Tuple[str, JobReference]]:
"""A ``FILE_LOADS`` method attribute
Returns: A PCollection of the table destinations that were successfully
loaded to using the batch load API, along with the load job IDs.
Raises: AttributeError: if accessed with a write method
besides ``FILE_LOADS``."""
self.validate([WriteToBigQuery.Method.FILE_LOADS],
'DESTINATION_JOBID_PAIRS')
return self._destination_load_jobid_pairs
@property
def destination_file_pairs(self) -> PCollection[Tuple[str, Tuple[str, int]]]:
"""A ``FILE_LOADS`` method attribute
Returns: A PCollection of the table destinations along with the
temp files used as sources to load from.
Raises: AttributeError: if accessed with a write method
besides ``FILE_LOADS``."""
self.validate([WriteToBigQuery.Method.FILE_LOADS], 'DESTINATION_FILE_PAIRS')
return self._destination_file_pairs
@property
def destination_copy_jobid_pairs(
self) -> PCollection[Tuple[str, JobReference]]:
"""A ``FILE_LOADS`` method attribute
Returns: A PCollection of the table destinations that were successfully
copied to, along with the copy job ID.
Raises: AttributeError: if accessed with a write method
besides ``FILE_LOADS``."""
self.validate([WriteToBigQuery.Method.FILE_LOADS],
'DESTINATION_COPY_JOBID_PAIRS')
return self._destination_copy_jobid_pairs
@property
def failed_rows(self) -> PCollection[Tuple[str, dict]]:
"""A ``[STREAMING_INSERTS, STORAGE_WRITE_API]`` method attribute
Returns: A PCollection of rows that failed when inserting to BigQuery.
Raises: AttributeError: if accessed with a write method
besides ``[STREAMING_INSERTS, STORAGE_WRITE_API]``."""
self.validate([
WriteToBigQuery.Method.STREAMING_INSERTS,
WriteToBigQuery.Method.STORAGE_WRITE_API
],
'FAILED_ROWS')
return self._failed_rows
@property
def failed_rows_with_errors(self) -> PCollection[Tuple[str, dict, list]]:
"""A ``[STREAMING_INSERTS, STORAGE_WRITE_API]`` method attribute
Returns:
A PCollection of rows that failed when inserting to BigQuery,
along with their errors.
Raises:
AttributeError: if accessed with a write method
besides ``[STREAMING_INSERTS, STORAGE_WRITE_API]``."""
self.validate([
WriteToBigQuery.Method.STREAMING_INSERTS,
WriteToBigQuery.Method.STORAGE_WRITE_API
],
'FAILED_ROWS_WITH_ERRORS')
return self._failed_rows_with_errors
def __getitem__(self, key):
if key not in self.attributes:
raise AttributeError(
f'Error trying to access nonexistent attribute `{key}` in write '
'result. Please see __documentation__ for available attributes.')
return self.attributes[key].__get__(self, WriteResult)
class StorageWriteToBigQuery(PTransform):
"""Writes data to BigQuery using Storage API.
Supports dynamic destinations. Dynamic schemas are not supported yet.
Experimental; no backwards compatibility guarantees.
"""
IDENTIFIER = "beam:schematransform:org.apache.beam:bigquery_storage_write:v2"
FAILED_ROWS = "FailedRows"
FAILED_ROWS_WITH_ERRORS = "FailedRowsWithErrors"
# fields for rows sent to Storage API with dynamic destinations
DESTINATION = "destination"
RECORD = "record"
# magic string to tell Java that these rows are going to dynamic destinations
DYNAMIC_DESTINATIONS = "DYNAMIC_DESTINATIONS"
def __init__(
self,
table,
table_side_inputs=None,
schema=None,
create_disposition=BigQueryDisposition.CREATE_IF_NEEDED,
write_disposition=BigQueryDisposition.WRITE_APPEND,
triggering_frequency=0,
use_at_least_once=False,
with_auto_sharding=False,
num_storage_api_streams=0,
expansion_service=None):
self._table = table
self._table_side_inputs = table_side_inputs
self._schema = schema
self._create_disposition = create_disposition
self._write_disposition = write_disposition
self._triggering_frequency = triggering_frequency
self._use_at_least_once = use_at_least_once
self._with_auto_sharding = with_auto_sharding
self._num_storage_api_streams = num_storage_api_streams
self._expansion_service = expansion_service or BeamJarExpansionService(
'sdks:java:io:google-cloud-platform:expansion-service:build')
def expand(self, input):
if self._schema is None:
try:
schema = schema_from_element_type(input.element_type)
is_rows = True
except TypeError as exn:
raise ValueError(
"A schema is required in order to prepare rows"
"for writing with STORAGE_WRITE_API.") from exn
elif callable(self._schema):
raise NotImplementedError(
"Writing with dynamic schemas is not"
"supported for this write method.")
elif isinstance(self._schema, vp.ValueProvider):
schema = self._schema.get()
is_rows = False
else:
schema = self._schema
is_rows = False
table = bigquery_tools.get_hashable_destination(self._table)
# if writing to one destination, just convert to Beam rows and send over
if not callable(table):
if is_rows:
input_beam_rows = input
else:
input_beam_rows = (
input
| "Convert dict to Beam Row" >> self.ConvertToBeamRows(
schema, False).with_output_types())
# For dynamic destinations, we first figure out where each row is going.
# Then we send (destination, record) rows over to Java SchemaTransform.
# We need to do this here because there are obstacles to passing the
# destinations function to Java
else:
# call function and append destination to each row
input_rows = (
input
| "Append dynamic destinations" >> beam.ParDo(
bigquery_tools.AppendDestinationsFn(table),
*self._table_side_inputs))
# if input type is Beam Row, just wrap everything in another Row
if is_rows:
input_beam_rows = (
input_rows
| "Wrap in Beam Row" >> beam.Map(
lambda row: beam.Row(
**{
StorageWriteToBigQuery.DESTINATION: row[0],
StorageWriteToBigQuery.RECORD: row[1]
})).with_output_types(
RowTypeConstraint.from_fields([
(StorageWriteToBigQuery.DESTINATION, str),
(StorageWriteToBigQuery.RECORD, input.element_type)
])))
# otherwise, convert to Beam Rows
else:
input_beam_rows = (
input_rows
| "Convert dict to Beam Row" >> self.ConvertToBeamRows(
schema, True).with_output_types())
# communicate to Java that this write should use dynamic destinations
table = StorageWriteToBigQuery.DYNAMIC_DESTINATIONS
output = (
input_beam_rows
| SchemaAwareExternalTransform(
identifier=StorageWriteToBigQuery.IDENTIFIER,
expansion_service=self._expansion_service,
rearrange_based_on_discovery=True,
table=table,
create_disposition=self._create_disposition,
write_disposition=self._write_disposition,
triggering_frequency_seconds=self._triggering_frequency,
auto_sharding=self._with_auto_sharding,
num_streams=self._num_storage_api_streams,
use_at_least_once_semantics=self._use_at_least_once,
error_handling={
'output': StorageWriteToBigQuery.FAILED_ROWS_WITH_ERRORS
}))
failed_rows_with_errors = output[
StorageWriteToBigQuery.FAILED_ROWS_WITH_ERRORS]
failed_rows = failed_rows_with_errors | beam.Map(
lambda row_and_error: row_and_error[0])
if not is_rows:
# return back from Beam Rows to Python dict elements
failed_rows = failed_rows | beam.Map(lambda row: row.as_dict())
failed_rows_with_errors = failed_rows_with_errors | beam.Map(
lambda row: {
"error_message": row.error_message,
"failed_row": row.failed_row.as_dict()
})
return WriteResult(
method=WriteToBigQuery.Method.STORAGE_WRITE_API,
failed_rows=failed_rows,
failed_rows_with_errors=failed_rows_with_errors)
class ConvertToBeamRows(PTransform):
def __init__(self, schema, dynamic_destinations):
self.schema = schema
self.dynamic_destinations = dynamic_destinations
def expand(self, input_dicts):
if self.dynamic_destinations:
return (
input_dicts
| "Convert dict to Beam Row" >> beam.Map(
lambda row: beam.Row(
**{
StorageWriteToBigQuery.DESTINATION: row[0],
StorageWriteToBigQuery.RECORD: bigquery_tools.
beam_row_from_dict(row[1], self.schema)
})))
else:
return (
input_dicts
| "Convert dict to Beam Row" >> beam.Map(
lambda row: bigquery_tools.beam_row_from_dict(row, self.schema))
)
def with_output_types(self):
row_type_hints = bigquery_tools.get_beam_typehints_from_tableschema(
self.schema)
if self.dynamic_destinations:
type_hint = RowTypeConstraint.from_fields([
(StorageWriteToBigQuery.DESTINATION, str),
(
StorageWriteToBigQuery.RECORD,
RowTypeConstraint.from_fields(row_type_hints))
])
else:
type_hint = RowTypeConstraint.from_fields(row_type_hints)
return super().with_output_types(type_hint)
[docs]class ReadFromBigQuery(PTransform):
# pylint: disable=line-too-long,W1401
"""Read data from BigQuery.
This PTransform uses a BigQuery export job to take a snapshot of the table
on GCS, and then reads from each produced file. File format is Avro by
default.
Args:
method: The method to use to read from BigQuery. It may be EXPORT or
DIRECT_READ. EXPORT invokes a BigQuery export request
(https://cloud.google.com/bigquery/docs/exporting-data). DIRECT_READ reads
directly from BigQuery storage using the BigQuery Read API
(https://cloud.google.com/bigquery/docs/reference/storage). If
unspecified, the default is currently EXPORT.
use_native_datetime (bool): By default this transform exports BigQuery
DATETIME fields as formatted strings (for example:
2021-01-01T12:59:59). If :data:`True`, BigQuery DATETIME fields will
be returned as native Python datetime objects. This can only be used when
'method' is 'DIRECT_READ'.
table (str, callable, ValueProvider): The ID of the table, or a callable
that returns it. If dataset argument is :data:`None` then the table
argument must contain the entire table reference specified as:
``'DATASET.TABLE'`` or ``'PROJECT:DATASET.TABLE'``. If it's a callable,
it must receive one argument representing an element to be written to
BigQuery, and return a TableReference, or a string table name as specified
above.
dataset (str): The ID of the dataset containing this table or
:data:`None` if the table reference is specified entirely by the table
argument.
project (str): The ID of the project containing this table.
query (str, ValueProvider): A query to be used instead of arguments
table, dataset, and project.
validate (bool): If :data:`True`, various checks will be done when source
gets initialized (e.g., is table present?). This should be
:data:`True` for most scenarios in order to catch errors as early as
possible (pipeline construction instead of pipeline execution). It
should be :data:`False` if the table is created during pipeline
execution by a previous step.
coder (~apache_beam.coders.coders.Coder): The coder for the table
rows. If :data:`None`, then the default coder is
_JsonToDictCoder, which will interpret every row as a JSON
serialized dictionary.
use_standard_sql (bool): Specifies whether to use BigQuery's standard SQL
dialect for this query. The default value is :data:`False`.
If set to :data:`True`, the query will use BigQuery's updated SQL
dialect with improved standards compliance.
This parameter is ignored for table inputs.
flatten_results (bool): Flattens all nested and repeated fields in the
query results. The default value is :data:`True`.
kms_key (str): Optional Cloud KMS key name for use when creating new
temporary tables.
gcs_location (str, ValueProvider): The name of the Google Cloud Storage
bucket where the extracted table should be written as a string or
a :class:`~apache_beam.options.value_provider.ValueProvider`. If
:data:`None`, then the temp_location parameter is used.
bigquery_job_labels (dict): A dictionary with string labels to be passed
to BigQuery export and query jobs created by this transform. See:
https://cloud.google.com/bigquery/docs/reference/rest/v2/Job#JobConfiguration
use_json_exports (bool): By default, this transform works by exporting
BigQuery data into Avro files, and reading those files. With this
parameter, the transform will instead export to JSON files. JSON files
are slower to read due to their larger size.
When using JSON exports, the BigQuery types for DATE, DATETIME, TIME, and
TIMESTAMP will be exported as strings. This behavior is consistent with
BigQuerySource.
When using Avro exports, these fields will be exported as native Python
types (datetime.date, datetime.datetime, datetime.datetime,
and datetime.datetime respectively). Avro exports are recommended.
To learn more about BigQuery types, and Time-related type
representations,
see: https://cloud.google.com/bigquery/docs/reference/standard-sql/data-types
To learn more about type conversions between BigQuery and Avro, see:
https://cloud.google.com/bigquery/docs/loading-data-cloud-storage-avro#avro_conversions
temp_dataset (``apache_beam.io.gcp.internal.clients.bigquery.DatasetReference``):
Temporary dataset reference to use when reading from BigQuery using a
query. When reading using a query, BigQuery source will create a
temporary dataset and a temporary table to store the results of the
query. With this option, you can set an existing dataset to create the
temporary table in. BigQuery source will create a temporary table in
that dataset, and will remove it once it is not needed. Job needs access
to create and delete tables within the given dataset. Dataset name
should *not* start with the reserved prefix `beam_temp_dataset_`.
query_priority (BigQueryQueryPriority): By default, this transform runs
queries with BATCH priority. Use :attr:`BigQueryQueryPriority.INTERACTIVE`
to run queries with INTERACTIVE priority. This option is ignored when
reading from a table rather than a query. To learn more about query
priority, see: https://cloud.google.com/bigquery/docs/running-queries
output_type (str): By default, this source yields Python dictionaries
(`PYTHON_DICT`). There is experimental support for producing a
PCollection with a schema and yielding Beam Rows via the option
`BEAM_ROW`. For more information on schemas, see
https://beam.apache.org/documentation/programming-guide/#what-is-a-schema)
"""
[docs] class Method(object):
EXPORT = 'EXPORT' # This is currently the default.
DIRECT_READ = 'DIRECT_READ'
COUNTER = 0
def __init__(
self,
gcs_location=None,
method=None,
use_native_datetime=False,
output_type=None,
*args,
**kwargs):
self.method = method or ReadFromBigQuery.Method.EXPORT
self.use_native_datetime = use_native_datetime
self.output_type = output_type
self._args = args
self._kwargs = kwargs
if self.method == ReadFromBigQuery.Method.EXPORT \
and self.use_native_datetime is True:
raise TypeError(
'The "use_native_datetime" parameter cannot be True for EXPORT.'
' Please set the "use_native_datetime" parameter to False *OR*'
' set the "method" parameter to ReadFromBigQuery.Method.DIRECT_READ.')
if gcs_location and self.method == ReadFromBigQuery.Method.EXPORT:
if not isinstance(gcs_location, (str, ValueProvider)):
raise TypeError(
'%s: gcs_location must be of type string'
' or ValueProvider; got %r instead' %
(self.__class__.__name__, type(gcs_location)))
if isinstance(gcs_location, str):
gcs_location = StaticValueProvider(str, gcs_location)
if self.output_type == 'BEAM_ROW' and self._kwargs.get('query',
None) is not None:
raise ValueError(
"Both a query and an output type of 'BEAM_ROW' were specified. "
"'BEAM_ROW' is not currently supported with queries.")
self.gcs_location = gcs_location
self.bigquery_dataset_labels = {
'type': 'bq_direct_read_' + str(uuid.uuid4())[0:10]
}
[docs] def expand(self, pcoll):
if self.method == ReadFromBigQuery.Method.EXPORT:
output_pcollection = self._expand_export(pcoll)
elif self.method == ReadFromBigQuery.Method.DIRECT_READ:
output_pcollection = self._expand_direct_read(pcoll)
else:
raise ValueError(
'The method to read from BigQuery must be either EXPORT '
'or DIRECT_READ.')
return self._expand_output_type(output_pcollection)
def _expand_output_type(self, output_pcollection):
if self.output_type == 'PYTHON_DICT' or self.output_type is None:
return output_pcollection
elif self.output_type == 'BEAM_ROW':
table_details = bigquery_tools.parse_table_reference(
table=self._kwargs.get("table", None),
dataset=self._kwargs.get("dataset", None),
project=self._kwargs.get("project", None))
if isinstance(self._kwargs['table'], ValueProvider):
raise TypeError(
'%s: table must be of type string'
'; got ValueProvider instead' % self.__class__.__name__)
elif callable(self._kwargs['table']):
raise TypeError(
'%s: table must be of type string'
'; got a callable instead' % self.__class__.__name__)
return output_pcollection | bigquery_schema_tools.convert_to_usertype(
bigquery_tools.BigQueryWrapper().get_table(
project_id=table_details.projectId,
dataset_id=table_details.datasetId,
table_id=table_details.tableId).schema,
self._kwargs.get('selected_fields', None))
else:
raise ValueError(
'The output type from BigQuery must be either PYTHON_DICT '
'or BEAM_ROW.')
def _expand_export(self, pcoll):
# TODO(https://github.com/apache/beam/issues/20683): Make ReadFromBQ rely
# on ReadAllFromBQ implementation.
temp_location = pcoll.pipeline.options.view_as(
GoogleCloudOptions).temp_location
job_name = pcoll.pipeline.options.view_as(GoogleCloudOptions).job_name
gcs_location_vp = self.gcs_location
unique_id = str(uuid.uuid4())[0:10]
def file_path_to_remove(unused_elm):
gcs_location = bigquery_export_destination_uri(
gcs_location_vp, temp_location, unique_id, True)
return gcs_location + '/'
files_to_remove_pcoll = beam.pvalue.AsList(
pcoll.pipeline
| 'FilesToRemoveImpulse' >> beam.Create([None])
| 'MapFilesToRemove' >> beam.Map(file_path_to_remove))
try:
step_name = self.label
except AttributeError:
step_name = 'ReadFromBigQuery_%d' % ReadFromBigQuery.COUNTER
ReadFromBigQuery.COUNTER += 1
return (
pcoll
| beam.io.Read(
_CustomBigQuerySource(
gcs_location=self.gcs_location,
pipeline_options=pcoll.pipeline.options,
method=self.method,
job_name=job_name,
step_name=step_name,
unique_id=unique_id,
*self._args,
**self._kwargs))
| _PassThroughThenCleanup(files_to_remove_pcoll))
def _expand_direct_read(self, pcoll):
project_id = None
temp_table_ref = None
if 'temp_dataset' in self._kwargs:
temp_table_ref = bigquery.TableReference(
projectId=self._kwargs['temp_dataset'].projectId,
datasetId=self._kwargs['temp_dataset'].datasetId,
tableId='beam_temp_table_' + uuid.uuid4().hex)
else:
project_id = pcoll.pipeline.options.view_as(GoogleCloudOptions).project
pipeline_details = {}
if temp_table_ref is not None:
pipeline_details['temp_table_ref'] = temp_table_ref
elif project_id is not None:
pipeline_details['project_id'] = project_id
pipeline_details['bigquery_dataset_labels'] = self.bigquery_dataset_labels
def _get_pipeline_details(unused_elm):
return pipeline_details
project_to_cleanup_pcoll = beam.pvalue.AsList(
pcoll.pipeline
| 'ProjectToCleanupImpulse' >> beam.Create([None])
| 'MapProjectToCleanup' >> beam.Map(_get_pipeline_details))
return (
pcoll
| beam.io.Read(
_CustomBigQueryStorageSource(
pipeline_options=pcoll.pipeline.options,
method=self.method,
use_native_datetime=self.use_native_datetime,
temp_table=temp_table_ref,
bigquery_dataset_labels=self.bigquery_dataset_labels,
*self._args,
**self._kwargs))
| _PassThroughThenCleanupTempDatasets(project_to_cleanup_pcoll))
[docs]class ReadFromBigQueryRequest:
"""
Class that defines data to read from BQ.
"""
def __init__(
self,
query: str = None,
use_standard_sql: bool = True,
table: Union[str, TableReference] = None,
flatten_results: bool = False):
"""
Only one of query or table should be specified.
:param query: SQL query to fetch data.
:param use_standard_sql:
Specifies whether to use BigQuery's standard SQL dialect for this query.
The default value is :data:`True`. If set to :data:`False`,
the query will use BigQuery's legacy SQL dialect.
This parameter is ignored for table inputs.
:param table:
The ID of the table to read. Table should define project and dataset
(ex.: ``'PROJECT:DATASET.TABLE'``).
:param flatten_results:
Flattens all nested and repeated fields in the query results.
The default value is :data:`False`.
"""
self.flatten_results = flatten_results
self.query = query
self.use_standard_sql = use_standard_sql
self.table = table
self.validate()
# We use this internal object ID to generate BigQuery export directories
# and to create BigQuery job names
self.obj_id = '%d_%s' % (int(time.time()), secrets.token_hex(3))
[docs] def validate(self):
if self.table is not None and self.query is not None:
raise ValueError(
'Both a BigQuery table and a query were specified.'
' Please specify only one of these.')
elif self.table is None and self.query is None:
raise ValueError('A BigQuery table or a query must be specified')
if self.table is not None:
if isinstance(self.table, str):
assert self.table.find('.'), (
'Expected a table reference '
'(PROJECT:DATASET.TABLE or DATASET.TABLE) instead of %s'
% self.table)
[docs]class ReadAllFromBigQuery(PTransform):
"""Read data from BigQuery.
PTransform:ReadFromBigQueryRequest->Rows
This PTransform uses a BigQuery export job to take a snapshot of the table
on GCS, and then reads from each produced file. Data is exported into
a new subdirectory for each export using UUIDs generated in
`ReadFromBigQueryRequest` objects.
It is recommended not to use this PTransform for streaming jobs on
GlobalWindow, since it will not be able to cleanup snapshots.
Args:
gcs_location (str): The name of the Google Cloud Storage
bucket where the extracted table should be written as a string. If
:data:`None`, then the temp_location parameter is used.
validate (bool): If :data:`True`, various checks will be done when source
gets initialized (e.g., is table present?).
kms_key (str): Experimental. Optional Cloud KMS key name for use when
creating new temporary tables.
"""
COUNTER = 0
def __init__(
self,
gcs_location: Union[str, ValueProvider] = None,
validate: bool = False,
kms_key: str = None,
temp_dataset: Union[str, DatasetReference] = None,
bigquery_job_labels: Dict[str, str] = None,
query_priority: str = BigQueryQueryPriority.BATCH):
if gcs_location:
if not isinstance(gcs_location, (str, ValueProvider)):
raise TypeError(
'%s: gcs_location must be of type string'
' or ValueProvider; got %r instead' %
(self.__class__.__name__, type(gcs_location)))
self.gcs_location = gcs_location
self.validate = validate
self.kms_key = kms_key
self.bigquery_job_labels = bigquery_job_labels
self.temp_dataset = temp_dataset
self.query_priority = query_priority
[docs] def expand(self, pcoll):
job_name = pcoll.pipeline.options.view_as(GoogleCloudOptions).job_name
project = pcoll.pipeline.options.view_as(GoogleCloudOptions).project
unique_id = str(uuid.uuid4())[0:10]
try:
step_name = self.label
except AttributeError:
step_name = 'ReadAllFromBigQuery_%d' % ReadAllFromBigQuery.COUNTER
ReadAllFromBigQuery.COUNTER += 1
sources_to_read, cleanup_locations = (
pcoll
| beam.ParDo(
_BigQueryReadSplit(
options=pcoll.pipeline.options,
gcs_location=self.gcs_location,
bigquery_job_labels=self.bigquery_job_labels,
job_name=job_name,
step_name=step_name,
unique_id=unique_id,
kms_key=self.kms_key,
project=project,
temp_dataset=self.temp_dataset,
query_priority=self.query_priority)).with_outputs(
"location_to_cleanup", main="files_to_read")
)
return (
sources_to_read
| SDFBoundedSourceReader(data_to_display=self.display_data())
| _PassThroughThenCleanup(beam.pvalue.AsIter(cleanup_locations)))