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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