com.google.cloud.dataflow.sdk.transforms

Class Combine.PerKeyWithHotKeys<K,VI,VO>

java.lang.Object

com.google.cloud.dataflow.sdk.transforms.PTransform<PCollection<KV<K,VI>>,PCollection<KV<K,VO>>>

com.google.cloud.dataflow.sdk.transforms.Combine.PerKeyWithHotKeys<K,VI,VO>

All Implemented Interfaces:

java.io.Serializable

Enclosing class:

Combine

public static class Combine.PerKeyWithHotKeys<K,VI,VO>
extends PTransform<PCollection<KV<K,VI>>,PCollection<KV<K,VO>>>

Like Combine.PerKey, but sharding the combining of hot keys.

See Also:

Serialized Form

Field Summary

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

name

Method Summary

Methods

Modifier and Type	Method and Description
PCollection<KV<K,VO>>	apply(PCollection<KV<K,VI>> input) Applies this PTransform on the given Input, and returns its Output.
protected java.lang.String	getKindString() Returns a string describing what kind of PTransform this is.
Combine.PerKeyWithHotKeys<K,VI,VO>	withName(java.lang.String name) Sets the base name of this PTransform and returns itself.

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

finishSpecifying, getCoderRegistry, getDefaultName, getDefaultOutputCoder, getDefaultOutputCoder, getInput, getName, getOutput, getPipeline, setName, setPipeline, toString

Methods inherited from class java.lang.Object

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

Method Detail

withName

public Combine.PerKeyWithHotKeys<K,VI,VO> withName(java.lang.String name)

Description copied from class: PTransform

Sets the base name of this PTransform and returns itself.

This is a shortcut for calling PTransform.setName(java.lang.String), which allows method chaining.

Overrides:

withName in class PTransform<PCollection<KV<K,VI>>,PCollection<KV<K,VO>>>

apply

public PCollection<KV<K,VO>> apply(PCollection<KV<K,VI>> input)

Description copied from class: PTransform

Applies this PTransform on the given Input, 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<Input, Output>, Input).

Overrides:

apply in class PTransform<PCollection<KV<K,VI>>,PCollection<KV<K,VO>>>

getKindString

protected java.lang.String getKindString()

Description copied from class: PTransform

Returns a string describing what kind of PTransform this is.

By default, returns the base name of this PTransform's class.

Overrides:

getKindString in class PTransform<PCollection<KV<K,VI>>,PCollection<KV<K,VO>>>