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https://issues.apache.org/jira/browse/FLINK-2491?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16649234#comment-16649234
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Congxian Qiu commented on FLINK-2491:
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Hi all, what's the status of the issue, is it still needed? I'm interested in
this, did there any resources I can refer.
IMO, this could do by the following two ways:
1) add unregister operator instances operation in CheckpointCoordinator
2) triggerCheckpoint with `tasksToTrigger`, `tasksToWaitFor` and
`tasksToCommitTo`
> Checkpointing only works if all operators/tasks are still running
> -----------------------------------------------------------------
>
> Key: FLINK-2491
> URL: https://issues.apache.org/jira/browse/FLINK-2491
> Project: Flink
> Issue Type: Bug
> Components: DataStream API, State Backends, Checkpointing
> Affects Versions: 0.10.0
> Reporter: Robert Metzger
> Assignee: Márton Balassi
> Priority: Critical
>
> While implementing a test case for the Kafka Consumer, I came across the
> following bug:
> Consider the following topology, with the operator parallelism in parentheses:
> Source (2) --> Sink (1).
> In this setup, the {{snapshotState()}} method is called on the source, but
> not on the Sink.
> The sink receives the generated data.
> only one of the two sources is generating data.
> I've implemented a test case for this, you can find it here:
> https://github.com/rmetzger/flink/blob/para_checkpoint_bug/flink-tests/src/test/java/org/apache/flink/test/checkpointing/ParallelismChangeCheckpoinedITCase.java
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