[jira] [Commented] (FLINK-14646) Check null for key in KeyGroupStreamPartitioner

["Jiayi Liao (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/FLINK-14646?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16968929#comment-16968929 ] 

Jiayi Liao commented on FLINK-14646:
------------------------------------

cc [~trohrmann] [~aljoscha]

> Check null for key in KeyGroupStreamPartitioner
> -----------------------------------------------
>
>                 Key: FLINK-14646
>                 URL: https://issues.apache.org/jira/browse/FLINK-14646
>             Project: Flink
>          Issue Type: Improvement
>          Components: Runtime / State Backends
>    Affects Versions: 1.9.0
>            Reporter: Jiayi Liao
>            Priority: Major
>
> We should check null for {{key}} in {{selectChannel}} function in {{KeyGroupStreamPartitioner}} because {{KeyGroupRangeAssignment}} does not allow null key for assignment. And if we produce a null key in {{KeyGroupStreamPartitioner}}, the exception is not clear enough.
> {code:java}
> Caused by: java.lang.NullPointerException
> 	at org.apache.flink.runtime.state.KeyGroupRangeAssignment.assignToKeyGroup(KeyGroupRangeAssignment.java:60)
> 	at org.apache.flink.runtime.state.KeyGroupRangeAssignment.assignKeyToParallelOperator(KeyGroupRangeAssignment.java:49)
> 	at org.apache.flink.streaming.runtime.partitioner.KeyGroupStreamPartitioner.selectChannel(KeyGroupStreamPartitioner.java:58)
> 	at org.apache.flink.streaming.runtime.partitioner.KeyGroupStreamPartitioner.selectChannel(KeyGroupStreamPartitioner.java:32)
> 	at org.apache.flink.runtime.io.network.api.writer.RecordWriter.emit(RecordWriter.java:120)
> 	at org.apache.flink.streaming.runtime.io.RecordWriterOutput.pushToRecordWriter(RecordWriterOutput.java:110)
> 	... 9 more
> {code}



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