Jingsong Lee created FLINK-6620:
-----------------------------------
Summary: Add KeyGroupCheckpointedOperator interface that works for
checkpointing key-groups
Key: FLINK-6620
URL: https://issues.apache.org/jira/browse/FLINK-6620
Project: Flink
Issue Type: Improvement
Components: DataStream API
Reporter: Jingsong Lee
Priority: Minor
[~aljoscha] We have discussed it on:
https://issues.apache.org/jira/browse/BEAM-1393
{code}
/**
* This interface is used to checkpoint key-groups state.
*/
public interface KeyGroupCheckpointedOperator extends KeyGroupRestoringOperator{
/**
* Snapshots the state for a given {@code keyGroupIdx}.
*
* <p>AbstractStreamOperator would call this hook in
* AbstractStreamOperator.snapshotState() while iterating over the key groups.
* @param keyGroupIndex the id of the key-group to be put in the snapshot.
* @param out the stream to write to.
*/
void snapshotKeyGroupState(int keyGroupIndex, DataOutputStream out) throws
Exception;
}
{code}
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