AvroIO.Write.Bound (Google Cloud Dataflow SDK 1.9.1 API)

Google Cloud Dataflow SDK for Java, version 1.9.1

Warning: Dataflow SDK 1.x for Java is unsupported as of October 16, 2018. See Migrating from Dataflow SDK 1.x for Java for migration guidance.

Note: If you are using Cloud Dataflow SDK version 2.x, see the Apache Beam API reference documentation.

com.google.cloud.dataflow.sdk.io

Class AvroIO.Write.Bound<T>

• java.lang.Object
• • com.google.cloud.dataflow.sdk.transforms.PTransform<PCollection<T>,PDone>
  • • com.google.cloud.dataflow.sdk.io.AvroIO.Write.Bound<T>

• Type Parameters:

  T - the type of each of the elements of the input PCollection

  All Implemented Interfaces:

  HasDisplayData, Serializable

  Enclosing class:

  AvroIO.Write

  ---

  
  

  public static class AvroIO.Write.Bound<T>
  extends PTransform<PCollection<T>,PDone>

  A PTransform that writes a bounded PCollection to an Avro file (or multiple Avro files matching a sharding pattern).

  See Also:

  Serialized Form

• • Field Summary

    • Fields inherited from class com.google.cloud.dataflow.sdk.transforms.PTransform

      name

  • Method Summary

    All Methods Instance Methods Concrete Methods 

    Modifier and Type	Method and Description
    PDone	apply(PCollection<T> input) Applies this PTransform on the given InputT, and returns its Output.
    protected Coder<Void>	getDefaultOutputCoder() Returns the default Coder to use for the output of this single-output PTransform.
    String	getFilenamePrefix()
    String	getFilenameSuffix()
    int	getNumShards()
    Schema	getSchema()
    String	getShardNameTemplate() Returns the current shard name template string.
    String	getShardTemplate()
    Class<T>	getType()
    AvroIO.Write.Bound<T>	named(String name) Returns a new PTransform that's like this one but with the given step name.
    boolean	needsValidation()
    void	populateDisplayData(DisplayData.Builder builder) Register display data for the given transform or component.
    AvroIO.Write.Bound<T>	to(String filenamePrefix) Returns a new PTransform that's like this one but that writes to the file(s) with the given filename prefix.
    AvroIO.Write.Bound<T>	withNumShards(int numShards) Returns a new PTransform that's like this one but that uses the provided shard count.
    AvroIO.Write.Bound<T>	withoutSharding() Returns a new PTransform that's like this one but that forces a single file as output.
    AvroIO.Write.Bound<T>	withoutValidation() Returns a new PTransform that's like this one but that has GCS output path validation on pipeline creation disabled.
    <X> AvroIO.Write.Bound<X>	withSchema(Class<X> type) Returns a new PTransform that's like this one but that writes to Avro file(s) containing records whose type is the specified Avro-generated class.
    AvroIO.Write.Bound<GenericRecord>	withSchema(Schema schema) Returns a new PTransform that's like this one but that writes to Avro file(s) containing records of the specified schema.
    AvroIO.Write.Bound<GenericRecord>	withSchema(String schema) Returns a new PTransform that's like this one but that writes to Avro file(s) containing records of the specified schema in a JSON-encoded string form.
    AvroIO.Write.Bound<T>	withShardNameTemplate(String shardTemplate) Returns a new PTransform that's like this one but that uses the given shard name template.
    AvroIO.Write.Bound<T>	withSuffix(String filenameSuffix) Returns a new PTransform that's like this one but that writes to the file(s) with the given filename suffix.

    • Methods inherited from class com.google.cloud.dataflow.sdk.transforms.PTransform

      getDefaultOutputCoder, getDefaultOutputCoder, getKindString, getName, toString, validate

    • Methods inherited from class java.lang.Object

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

• • Method Detail

    • named

      public AvroIO.Write.Bound<T> named(String name)

      Returns a new PTransform that's like this one but with the given step name.

      Does not modify this object.

    • to

      public AvroIO.Write.Bound<T> to(String filenamePrefix)

      Returns a new PTransform that's like this one but that writes to the file(s) with the given filename prefix.

      See AvroIO.Write.to(String) for more information about filenames.

      Does not modify this object.

    • withSuffix

      public AvroIO.Write.Bound<T> withSuffix(String filenameSuffix)

      Returns a new PTransform that's like this one but that writes to the file(s) with the given filename suffix.

      See ShardNameTemplate for a description of shard templates.

      Does not modify this object.

    • withNumShards

      public AvroIO.Write.Bound<T> withNumShards(int numShards)

      Returns a new PTransform that's like this one but that uses the provided shard count.

      Constraining the number of shards is likely to reduce the performance of a pipeline. Setting this value is not recommended unless you require a specific number of output files.

      Does not modify this object.

      Parameters:

      numShards - the number of shards to use, or 0 to let the system decide.

      See Also:

      ShardNameTemplate

    • withShardNameTemplate

      public AvroIO.Write.Bound<T> withShardNameTemplate(String shardTemplate)

      Returns a new PTransform that's like this one but that uses the given shard name template.

      Does not modify this object.

      See Also:

      ShardNameTemplate

    • withoutSharding

      public AvroIO.Write.Bound<T> withoutSharding()

      Returns a new PTransform that's like this one but that forces a single file as output.

      This is a shortcut for .withNumShards(1).withShardNameTemplate("")

      Does not modify this object.

    • withSchema

      public <X> AvroIO.Write.Bound<X> withSchema(Class<X> type)

      Returns a new PTransform that's like this one but that writes to Avro file(s) containing records whose type is the specified Avro-generated class.

      Does not modify this object.

      Type Parameters:

      X - the type of the elements of the input PCollection

    • withSchema

      public AvroIO.Write.Bound<GenericRecord> withSchema(Schema schema)

      Returns a new PTransform that's like this one but that writes to Avro file(s) containing records of the specified schema.

      Does not modify this object.

    • withSchema

      public AvroIO.Write.Bound<GenericRecord> withSchema(String schema)

      Returns a new PTransform that's like this one but that writes to Avro file(s) containing records of the specified schema in a JSON-encoded string form.

      Does not modify this object.

    • withoutValidation

      public AvroIO.Write.Bound<T> withoutValidation()

      Returns a new PTransform that's like this one but that has GCS output path validation on pipeline creation disabled.

      Does not modify this object.

      This can be useful in the case where the GCS output location does not exist at the pipeline creation time, but is expected to be available at execution time.

    • apply

      public PDone apply(PCollection<T> input)

      Description copied from class: PTransform
      Applies this PTransform on the given InputT, and returns its Output.

      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).

      The default implementation throws an exception. A derived class must either implement apply, or else each runner must supply a custom implementation via PipelineRunner.apply(com.google.cloud.dataflow.sdk.transforms.PTransform<InputT, OutputT>, InputT).

      Overrides:

      apply in class PTransform<PCollection<T>,PDone>

    • populateDisplayData

      public void populateDisplayData(DisplayData.Builder builder)

      Description copied from class: PTransform
      Register display data for the given transform or component.

      populateDisplayData(DisplayData.Builder) is invoked by Pipeline runners to collect display data via DisplayData.from(HasDisplayData). Implementations may call super.populateDisplayData(builder) in order to register display data in the current namespace, but should otherwise use subcomponent.populateDisplayData(builder) to use the namespace of the subcomponent.

      By default, does not register any display data. Implementors may override this method to provide their own display data.

      Specified by:

      populateDisplayData in interface HasDisplayData

      Overrides:

      populateDisplayData in class PTransform<PCollection<T>,PDone>

      Parameters:

      builder - The builder to populate with display data.

      See Also:

      HasDisplayData

    • getShardNameTemplate

      public String getShardNameTemplate()

      Returns the current shard name template string.

    • getDefaultOutputCoder

      protected Coder<Void> getDefaultOutputCoder()

      Description copied from class: PTransform
      Returns the default Coder to use for the output of this single-output PTransform.

      By default, always throws

      Overrides:

      getDefaultOutputCoder in class PTransform<PCollection<T>,PDone>

    • getFilenamePrefix

      public String getFilenamePrefix()

    • getShardTemplate

      public String getShardTemplate()

    • getNumShards

      public int getNumShards()

    • getFilenameSuffix

      public String getFilenameSuffix()

    • getType

      public Class<T> getType()

    • getSchema

      public Schema getSchema()

    • needsValidation

      public boolean needsValidation()