MergeOperatorStates (Flink : Libraries : State processor API 2.1.2-cp1 API)

java.lang.Object
- org.apache.flink.state.api.output.MergeOperatorStates

All Implemented Interfaces:

Serializable, org.apache.flink.api.common.functions.Function, org.apache.flink.api.common.functions.GroupReduceFunction<org.apache.flink.runtime.checkpoint.OperatorState,org.apache.flink.runtime.checkpoint.metadata.CheckpointMetadata>
```
@Internal
public class MergeOperatorStates
extends Object
implements org.apache.flink.api.common.functions.GroupReduceFunction<org.apache.flink.runtime.checkpoint.OperatorState,org.apache.flink.runtime.checkpoint.metadata.CheckpointMetadata>
```
A reducer that aggregates multiple OperatorState's into a single CheckpointMetadata.

See Also:

Serialized Form

Constructor Summary

Constructors
Constructor Description

MergeOperatorStates(long checkpointId, Collection<org.apache.flink.runtime.checkpoint.MasterState> masterStates)

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`void`	`reduce(Iterable<org.apache.flink.runtime.checkpoint.OperatorState> values, org.apache.flink.util.Collector<org.apache.flink.runtime.checkpoint.metadata.CheckpointMetadata> out)`

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

MergeOperatorStates

public MergeOperatorStates(long checkpointId,
                           Collection<org.apache.flink.runtime.checkpoint.MasterState> masterStates)

Method Detail
- reduce
```
public void reduce(Iterable<org.apache.flink.runtime.checkpoint.OperatorState> values,
                   org.apache.flink.util.Collector<org.apache.flink.runtime.checkpoint.metadata.CheckpointMetadata> out)
```
  Specified by:
  
  reduce in interface org.apache.flink.api.common.functions.GroupReduceFunction<org.apache.flink.runtime.checkpoint.OperatorState,org.apache.flink.runtime.checkpoint.metadata.CheckpointMetadata>