Package 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	Description
OperatorSubtaskStateReducer(OperatorIdentifier operatorIdentifier, int maxParallelism)

Method Summary

Modifier and Type	Method	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, setRuntimeContext

Methods inherited from class java.lang.Object

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

Constructor Details

OperatorSubtaskStateReducer

public OperatorSubtaskStateReducer(OperatorIdentifier operatorIdentifier,
 int maxParallelism)

Method Details

open

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

Specified by:

open in interface org.apache.flink.api.common.functions.RichFunction

Overrides:

open in class org.apache.flink.api.common.functions.AbstractRichFunction

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>