org.apache.flink.state.api.output

Class OperatorSubtaskStateReducer

java.lang.Object

org.apache.flink.api.common.functions.AbstractRichFunction

org.apache.flink.api.common.functions.RichGroupReduceFunction<TaggedOperatorSubtaskState,org.apache.flink.runtime.checkpoint.OperatorState>

org.apache.flink.state.api.output.OperatorSubtaskStateReducer

All Implemented Interfaces:

Serializable, org.apache.flink.api.common.functions.Function, org.apache.flink.api.common.functions.GroupReduceFunction<TaggedOperatorSubtaskState,org.apache.flink.runtime.checkpoint.OperatorState>, org.apache.flink.api.common.functions.RichFunction

@Internal
public class OperatorSubtaskStateReducer
extends org.apache.flink.api.common.functions.RichGroupReduceFunction<TaggedOperatorSubtaskState,org.apache.flink.runtime.checkpoint.OperatorState>

A reducer that aggregates all OperatorSubtaskState's for a particular operator into a single OperatorState.

See Also:

Serialized Form

Constructor Summary

Constructors

Constructor and Description
OperatorSubtaskStateReducer(org.apache.flink.runtime.jobgraph.OperatorID operatorID, int maxParallelism)

Method Summary

Modifier and Type	Method and Description
void	open(org.apache.flink.api.common.functions.OpenContext openContext)
void	reduce(Iterable<TaggedOperatorSubtaskState> values, org.apache.flink.util.Collector<org.apache.flink.runtime.checkpoint.OperatorState> out)

Methods inherited from class org.apache.flink.api.common.functions.AbstractRichFunction

close, getIterationRuntimeContext, getRuntimeContext, open, setRuntimeContext

Methods inherited from class java.lang.Object

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

Constructor Detail

OperatorSubtaskStateReducer

public OperatorSubtaskStateReducer(org.apache.flink.runtime.jobgraph.OperatorID operatorID,
                                   int maxParallelism)

Method Detail

open

public void open(org.apache.flink.api.common.functions.OpenContext openContext)
          throws Exception

Throws:

Exception

reduce

public void reduce(Iterable<TaggedOperatorSubtaskState> values,
                   org.apache.flink.util.Collector<org.apache.flink.runtime.checkpoint.OperatorState> out)

Specified by:

reduce in interface org.apache.flink.api.common.functions.GroupReduceFunction<TaggedOperatorSubtaskState,org.apache.flink.runtime.checkpoint.OperatorState>

Specified by:

reduce in class org.apache.flink.api.common.functions.RichGroupReduceFunction<TaggedOperatorSubtaskState,org.apache.flink.runtime.checkpoint.OperatorState>