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https://issues.apache.org/jira/browse/FLINK-2491?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17248586#comment-17248586
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Yun Gao commented on FLINK-2491:
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Hi [~swapnilkhante], very thanks for the attention! We are currently working on
it and hope to make some progress soon. Some possible workaround might be use
some kind of coordination to coordinator the sources to exit only after two
checkpoints after all the sources finished sending data.
> 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: Runtime / Checkpointing
> Affects Versions: 0.10.0
> Reporter: Robert Metzger
> Priority: Critical
> Attachments: fix_checkpoint_not_working_if_tasks_are_finished.patch
>
>
> 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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