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From Márton Balassi (JIRA) <j...@apache.org>
Subject [jira] [Commented] (FLINK-2491) Operators are not participating in state checkpointing in some cases
Date Wed, 12 Aug 2015 10:44:45 GMT

    [ https://issues.apache.org/jira/browse/FLINK-2491?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14693304#comment-14693304
] 

Márton Balassi commented on FLINK-2491:
---------------------------------------

This is troublesome, when setting log level to debug it shows that the `StreamTask` never
calls a checkpoint on the sink. I am looking into it.

> 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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