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[jira] [Created] (FLINK-10380) Check if key is not nul before assign to group in KeyedStream


Sayat Satybaldiyev created FLINK-10380:
------------------------------------------

             Summary: Check if key is not nul before assign to group in KeyedStream
                 Key: FLINK-10380
                 URL: https://issues.apache.org/jira/browse/FLINK-10380
             Project: Flink
          Issue Type: Task
    Affects Versions: 1.6.0
            Reporter: Sayat Satybaldiyev


If a user creates a KeyedStream and partition by key which might be null, Flink job throws NullPointerExceptoin at runtime. However, NPE that Flink throws hard to debug and understand as it doesn't refer to place in Flink job.

*Suggestion:*

Add precondition that checks if the key is not null and throw a descriptive error if it's a null.

 

*Job Example*:

 
{code:java}
DataStream<String> stream = env.fromCollection(Arrays.asList("aaa", "bbb"))
 .map(x -> (String)null)
 .keyBy(x -> x);{code}
 

 

An error that is thrown:

 
{code:java}
Exception in thread "main" org.apache.flink.runtime.client.JobExecutionException: java.lang.RuntimeException
 at org.apache.flink.runtime.minicluster.MiniCluster.executeJobBlocking(MiniCluster.java:623)
 at org.apache.flink.streaming.api.environment.LocalStreamEnvironment.execute(LocalStreamEnvironment.java:123)
 at org.myorg.quickstart.BuggyKeyedStream.main(BuggyKeyedStream.java:61)
Caused by: java.lang.RuntimeException
 at org.apache.flink.streaming.runtime.io.RecordWriterOutput.pushToRecordWriter(RecordWriterOutput.java:110)
 at org.apache.flink.streaming.runtime.io.RecordWriterOutput.collect(RecordWriterOutput.java:89)16:26:43,110 INFO org.apache.flink.runtime.rpc.akka.AkkaRpcService - Stopped Akka RPC service.
at org.apache.flink.streaming.runtime.io.RecordWriterOutput.collect(RecordWriterOutput.java:45)
 at org.apache.flink.streaming.api.operators.AbstractStreamOperator$CountingOutput.collect(AbstractStreamOperator.java:689)
 at org.apache.flink.streaming.api.operators.AbstractStreamOperator$CountingOutput.collect(AbstractStreamOperator.java:667)
 at org.apache.flink.streaming.api.operators.StreamMap.processElement(StreamMap.java:41)
 at org.apache.flink.streaming.runtime.io.StreamInputProcessor.processInput(StreamInputProcessor.java:202)
 at org.apache.flink.streaming.runtime.tasks.OneInputStreamTask.run(OneInputStreamTask.java:105)
 at org.apache.flink.streaming.runtime.tasks.StreamTask.invoke(StreamTask.java:300)
 at org.apache.flink.runtime.taskmanager.Task.run(Task.java:711)
 at java.lang.Thread.run(Thread.java:748)
Caused by: java.lang.NullPointerException
 at org.apache.flink.runtime.state.KeyGroupRangeAssignment.assignToKeyGroup(KeyGroupRangeAssignment.java:59)
 at org.apache.flink.runtime.state.KeyGroupRangeAssignment.assignKeyToParallelOperator(KeyGroupRangeAssignment.java:48)
 at org.apache.flink.streaming.runtime.partitioner.KeyGroupStreamPartitioner.selectChannels(KeyGroupStreamPartitioner.java:63)
 at org.apache.flink.streaming.runtime.partitioner.KeyGroupStreamPartitioner.selectChannels(KeyGroupStreamPartitioner.java:32)
 at org.apache.flink.runtime.io.network.api.writer.RecordWriter.emit(RecordWriter.java:104)
 at org.apache.flink.streaming.runtime.io.StreamRecordWriter.emit(StreamRecordWriter.java:81)
 at org.apache.flink.streaming.runtime.io.RecordWriterOutput.pushToRecordWriter(RecordWriterOutput.java:107)
{code}

... 10 more



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