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

[Shang Yuanchun (Jira)]

Jiayi Liao created FLINK-14646:
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             Summary: 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


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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