[jira] [Created] (FLINK-6620) Add KeyGroupCheckpointedOperator interface that works for checkpointing key-groups

[Shang Yuanchun (Jira)]

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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