org.apache.beam.sdk.io

Class ReadAllViaFileBasedSource<T>

java.lang.Object

org.apache.beam.sdk.transforms.PTransform<PCollection<FileIO.ReadableFile>,PCollection<T>>

org.apache.beam.sdk.io.ReadAllViaFileBasedSource<T>

All Implemented Interfaces:

java.io.Serializable, HasDisplayData

@Experimental(value=SOURCE_SINK)
public class ReadAllViaFileBasedSource<T>
extends PTransform<PCollection<FileIO.ReadableFile>,PCollection<T>>

Reads each file in the input PCollection of FileIO.ReadableFile using given parameters for splitting files into offset ranges and for creating a FileBasedSource for a file. The input PCollection must not contain directories.

To obtain the collection of FileIO.ReadableFile from a filepattern, use FileIO.readMatches().

See Also:

Serialized Form

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	ReadAllViaFileBasedSource.ReadFileRangesFnExceptionHandler A class to handle errors which occur during file reads.

Field Summary

Fields

Modifier and Type	Field and Description
protected static boolean	DEFAULT_USES_RESHUFFLE

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

name, resourceHints

Constructor Summary

Constructors

Constructor and Description
ReadAllViaFileBasedSource(long desiredBundleSizeBytes, SerializableFunction<java.lang.String,? extends FileBasedSource<T>> createSource, Coder<T> coder)
ReadAllViaFileBasedSource(long desiredBundleSizeBytes, SerializableFunction<java.lang.String,? extends FileBasedSource<T>> createSource, Coder<T> coder, boolean usesReshuffle, ReadAllViaFileBasedSource.ReadFileRangesFnExceptionHandler exceptionHandler)

Method Summary

Modifier and Type	Method and Description
PCollection<T>	expand(PCollection<FileIO.ReadableFile> 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, validate

Methods inherited from class java.lang.Object

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

Field Detail

DEFAULT_USES_RESHUFFLE

protected static final boolean DEFAULT_USES_RESHUFFLE

See Also:

Constant Field Values

Constructor Detail

ReadAllViaFileBasedSource

public ReadAllViaFileBasedSource(long desiredBundleSizeBytes,
                                 SerializableFunction<java.lang.String,? extends FileBasedSource<T>> createSource,
                                 Coder<T> coder)

ReadAllViaFileBasedSource

public ReadAllViaFileBasedSource(long desiredBundleSizeBytes,
                                 SerializableFunction<java.lang.String,? extends FileBasedSource<T>> createSource,
                                 Coder<T> coder,
                                 boolean usesReshuffle,
                                 ReadAllViaFileBasedSource.ReadFileRangesFnExceptionHandler exceptionHandler)

Method Detail

expand

public PCollection<T> expand(PCollection<FileIO.ReadableFile> 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<FileIO.ReadableFile>,PCollection<T>>