[jira] [Created] (FLINK-2491) Operators are not participating in state checkpointing in some cases

["Robert Metzger (JIRA)" <ji...@apache.org>]

Robert Metzger created FLINK-2491:
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             Summary: 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
            Reporter: Robert Metzger
            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.
The 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/tree/para_checkpoint_bug



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