com.google.cloud.dataflow.sdk.util

Class Reshuffle<K,V>

java.lang.Object

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

com.google.cloud.dataflow.sdk.util.Reshuffle<K,V>

Type Parameters:

K - The type of key being reshuffled on.

V - The type of value being reshuffled.

All Implemented Interfaces:

Serializable

public class Reshuffle<K,V>
extends PTransform<PCollection<KV<K,V>>,PCollection<KV<K,V>>>

A PTransform to reshuffle the elements based on their key.

Performs a GroupByKey so that the data is key-partitioned. Configures the WindowingStrategy so that no data is dropped, but doesn't affect the need for the user to specify allowed lateness and accumulation mode before a user-inserted GroupByKey.

See Also:

Serialized Form

Field Summary

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

name

Method Summary

Modifier and Type	Method and Description
PCollection<KV<K,V>>	apply(PCollection<KV<K,V>> input) Applies this PTransform on the given InputT, and returns its Output.
static <K,V> Reshuffle<K,V>	of()

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

getDefaultOutputCoder, 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

of

public static <K,V> Reshuffle<K,V> of()

apply

public PCollection<KV<K,V>> apply(PCollection<KV<K,V>> 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<KV<K,V>>,PCollection<KV<K,V>>>