Package org.apache.beam.sdk.transforms

Class Combine.PerKeyWithHotKeyFanout<K,InputT,OutputT>

java.lang.Object

org.apache.beam.sdk.transforms.PTransform<PCollection<KV<K,InputT>>,PCollection<KV<K,OutputT>>>

org.apache.beam.sdk.transforms.Combine.PerKeyWithHotKeyFanout<K,InputT,OutputT>

All Implemented Interfaces:

Serializable, HasDisplayData

Enclosing class:

Combine

public static class Combine.PerKeyWithHotKeyFanout<K,InputT,OutputT>
extends PTransform<PCollection<KV<K,InputT>>,PCollection<KV<K,OutputT>>>

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

See Also:

• Serialized Form

Field Summary

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

annotations, displayData, name, resourceHints

Method Summary

Modifier and Type	Method	Description
PCollection<KV<K,OutputT>>	expand(PCollection<KV<K,InputT>> input)	Override this method to specify how this PTransform should be expanded on the given InputT.
protected String	getKindString()	Returns the name to use by default for this PTransform (not including the names of any enclosing PTransforms).
List<PCollectionView<?>>	getSideInputs()	Returns the side inputs used by this Combine operation.
void	populateDisplayData(DisplayData.Builder builder)	Register display data for the given transform or component.

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

addAnnotation, compose, compose, getAdditionalInputs, getAnnotations, getDefaultOutputCoder, getDefaultOutputCoder, getDefaultOutputCoder, getName, getResourceHints, setDisplayData, setResourceHints, toString, validate, validate

Methods inherited from class java.lang.Object

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

Method Details

getKindString

protected String getKindString()

Description copied from class: PTransform

Returns the name to use by default for this PTransform (not including the names of any enclosing PTransforms).

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

The caller is responsible for ensuring that names of applied PTransforms are unique, e.g., by adding a uniquifying suffix when needed.

Overrides:

getKindString in class PTransform<PCollection<KV<K,InputT>>,PCollection<KV<K,OutputT>>>

expand

public PCollection<KV<K,OutputT>> expand(PCollection<KV<K,InputT>> 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<K,InputT>>,PCollection<KV<K,OutputT>>>

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<KV<K,InputT>>,PCollection<KV<K,OutputT>>>

Parameters:

builder - The builder to populate with display data.

See Also:

• HasDisplayData

getSideInputs

public List<PCollectionView<?>> getSideInputs()

Returns the side inputs used by this Combine operation.