[jira] [Created] (FLINK-1699) Co-task sometimes returns null

[JIRA]

Gábor Hermann created FLINK-1699:
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             Summary: Co-task sometimes returns null
                 Key: FLINK-1699
                 URL: https://issues.apache.org/jira/browse/FLINK-1699
             Project: Flink
          Issue Type: Bug
          Components: Streaming
            Reporter: Gábor Hermann
            Priority: Critical


Connecting two grouped data stream coMapping them and sinking it in a custom 
sink sometimes results in null records.



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