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https://issues.apache.org/jira/browse/FLINK-2491?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15874746#comment-15874746
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Stephan Ewen commented on FLINK-2491:
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[~srichter] For this to work properly, we need to take the status of sources
into account for the checkpoint.
There have been some discussions about how to do this in a more general way to
allow checkpoints for batch programs as well.
I think we should have a FLIP on that in the near future.
> Operators are not participating in state checkpointing in some cases
> --------------------------------------------------------------------
>
> Key: FLINK-2491
> URL: https://issues.apache.org/jira/browse/FLINK-2491
> Project: Flink
> Issue Type: Bug
> Components: Streaming
> Affects Versions: 0.10.0
> Reporter: Robert Metzger
> Assignee: Márton Balassi
> Priority: Critical
> Fix For: 1.0.0
>
>
> 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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