org.apache.beam.sdk.io.gcp.bigquery

Class CreateTables<DestinationT,ElementT>

java.lang.Object

org.apache.beam.sdk.transforms.PTransform<PCollection<KV<DestinationT,ElementT>>,PCollection<KV<TableDestination,ElementT>>>

org.apache.beam.sdk.io.gcp.bigquery.CreateTables<DestinationT,ElementT>

All Implemented Interfaces:

java.io.Serializable, HasDisplayData

public class CreateTables<DestinationT,ElementT>
extends PTransform<PCollection<KV<DestinationT,ElementT>>,PCollection<KV<TableDestination,ElementT>>>

Creates any tables needed before performing streaming writes to the tables. This is a side-effect DoFn, and returns the original collection unchanged.

See Also:

Serialized Form

Field Summary

Fields inherited from class org.apache.beam.sdk.transforms.PTransform

name, resourceHints

Constructor Summary

Constructors

Constructor and Description
CreateTables(BigQueryIO.Write.CreateDisposition createDisposition, DynamicDestinations<?,DestinationT> dynamicDestinations) The list of tables created so far, so we don't try the creation each time.

Method Summary

Modifier and Type	Method and Description
PCollection<KV<TableDestination,ElementT>>	expand(PCollection<KV<DestinationT,ElementT>> input) Override this method to specify how this PTransform should be expanded on the given InputT.

Methods inherited from class org.apache.beam.sdk.transforms.PTransform

compose, compose, getAdditionalInputs, getDefaultOutputCoder, getDefaultOutputCoder, getDefaultOutputCoder, getKindString, getName, getResourceHints, populateDisplayData, setResourceHints, toString, validate

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Detail

CreateTables

public CreateTables(BigQueryIO.Write.CreateDisposition createDisposition,
                    DynamicDestinations<?,DestinationT> dynamicDestinations)

The list of tables created so far, so we don't try the creation each time.

TODO: We should put a bound on memory usage of this. Use guava cache instead.

Method Detail

expand

public PCollection<KV<TableDestination,ElementT>> expand(PCollection<KV<DestinationT,ElementT>> input)

Description copied from class: PTransform

Override this method to specify how this PTransform should be expanded on the given InputT.

NOTE: This method should not be called directly. Instead apply the PTransform should be applied to the InputT using the apply method.

Composite transforms, which are defined in terms of other transforms, should return the output of one of the composed transforms. Non-composite transforms, which do not apply any transforms internally, should return a new unbound output and register evaluators (via backend-specific registration methods).

Specified by:

expand in class PTransform<PCollection<KV<DestinationT,ElementT>>,PCollection<KV<TableDestination,ElementT>>>