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https://issues.apache.org/jira/browse/FLINK-14646?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Till Rohrmann updated FLINK-14646:
----------------------------------
Priority: Minor (was: Major)
> Check non-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: 1.8.2, 1.10.0, 1.9.1
> Reporter: Jiayi Liao
> Assignee: Jiayi Liao
> Priority: Minor
> Labels: pull-request-available
> Fix For: 1.10.0, 1.8.3, 1.9.2
>
> Time Spent: 10m
> Remaining Estimate: 0h
>
> We should check non-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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