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

[Shang Yuanchun (Jira)]

Aljoscha Krettek created FLINK-3740:
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             Summary: 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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