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

["Márton Balassi (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/FLINK-2491?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Márton Balassi updated FLINK-2491:
----------------------------------
    Comment: was deleted

(was: Here is the root cause. [1]

[1] https://github.com/apache/flink/blob/master/flink-staging/flink-streaming/flink-streaming-core/src/main/java/org/apache/flink/streaming/api/graph/StreamingJobGraphGenerator.java#L415

The same parallelism case works because of chaining.)

> 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
>            Assignee: Márton Balassi
>            Priority: Critical
>             Fix For: 0.10
>
>
> 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/blob/para_checkpoint_bug/flink-tests/src/test/java/org/apache/flink/test/checkpointing/ParallelismChangeCheckpoinedITCase.java



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