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

["Gyula Fora (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/FLINK-1699?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Gyula Fora closed FLINK-1699.
-----------------------------
    Resolution: Fixed

> 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
>            Assignee: Gábor Hermann
>            Priority: Critical
>
> Connecting two grouped data stream coMapping them and sinking it in a custom sink sometimes results in null records.
> More specifically on in [this test|https://github.com/mbalassi/flink/blob/b6a2a8236404affb808267e47656791eceb57fe4/flink-staging/flink-streaming/flink-streaming-core/src/test/java/org/apache/flink/streaming/api/StreamCoTest.java] the result might be an array with null, thus getting
> java.lang.AssertionError: 
> Expected :[1, 3, 5, 1, 3, 5]
> Actual   :[null, 1, 5, 3, 1, 5]
> or not getting all the expected messages:
> java.lang.AssertionError: 
> Expected :[1, 1, 3, 3, 5, 5]
> Actual   :[1, 3, 5, 5]



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