K - The type of key being reshuffled on.V - The type of value being reshuffled.public class Reshuffle<K,V> extends PTransform<PCollection<KV<K,V>>,PCollection<KV<K,V>>>
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.
name| 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() |
getDefaultOutputCoder, getDefaultOutputCoder, getDefaultOutputCoder, getKindString, getName, toString, validatepublic static <K,V> Reshuffle<K,V> of()
public PCollection<KV<K,V>> apply(PCollection<KV<K,V>> input)
PTransformPTransform 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).
apply in class PTransform<PCollection<KV<K,V>>,PCollection<KV<K,V>>>