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https://issues.apache.org/jira/browse/FLINK-6620?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16018778#comment-16018778
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Aljoscha Krettek commented on FLINK-6620:
-----------------------------------------
[~lzljs3620320] Unfortunately I'm very busy last week and the next week
(ApacheCon and Strata London) so I'm very slow to respond to anything. Thanks
for opening this issue! 😃
[~srichter] What do you think about this? We've had an interface like this for
a while in Beam to support writing custom things along with the timers in
key-grouped state.
> 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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