[jira] [Commented] (FLINK-3740) Session Window State is Not Checkpointed

["ASF GitHub Bot (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/FLINK-3740?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15239030#comment-15239030 ] 

ASF GitHub Bot commented on FLINK-3740:
---------------------------------------

GitHub user aljoscha opened a pull request:

    https://github.com/apache/flink/pull/1878

    [FLINK-3740] Make Session Window State Checkpointed

    

You can merge this pull request into a Git repository by running:

    $ git pull https://github.com/aljoscha/flink window-snapshot-test

Alternatively you can review and apply these changes as the patch at:

    https://github.com/apache/flink/pull/1878.patch

To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:

    This closes #1878
    
----
commit 419d3bd53826d0dd0c40c2eaad83675eb4e14a5a
Author: Aljoscha Krettek <al...@gmail.com>
Date:   2016-04-12T14:27:18Z

    [FLINK-3740] Make Session Window State Checkpointed

----


> Session Window State is Not Checkpointed
> ----------------------------------------
>
>                 Key: FLINK-3740
>                 URL: https://issues.apache.org/jira/browse/FLINK-3740
>             Project: Flink
>          Issue Type: Bug
>          Components: Streaming
>            Reporter: Aljoscha Krettek
>            Assignee: Aljoscha Krettek
>
> The merging window state in the {{WindowOperator}} is not checkpointed. This means that programs containing session windows will fail upon restore after a failure.
> I propose adding a simulated snapshot/restore cycle to the tests in {{WindowOperatorTest}} to catch these problems in the future.



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