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From "Vladislav Pernin (JIRA)" <j...@apache.org>
Subject [jira] [Created] (FLINK-6001) NPE on TumblingEventTimeWindows with ContinuousEventTimeTrigger and allowedLateness
Date Wed, 08 Mar 2017 17:00:41 GMT
Vladislav Pernin created FLINK-6001:
---------------------------------------

             Summary: NPE on TumblingEventTimeWindows with ContinuousEventTimeTrigger and
allowedLateness
                 Key: FLINK-6001
                 URL: https://issues.apache.org/jira/browse/FLINK-6001
             Project: Flink
          Issue Type: Bug
          Components: DataStream API, Streaming
    Affects Versions: 1.2.0
            Reporter: Vladislav Pernin
            Priority: Critical


I try to isolate the problem in a small and simple reproducer by extracting the data from
my real setup.

I fails with NPE at :
{noformat}
java.lang.NullPointerException: null
	at org.apache.flink.streaming.api.windowing.triggers.ContinuousEventTimeTrigger.onEventTime(ContinuousEventTimeTrigger.java:81)
~[flink-streaming-java_2.11-1.2.0.jar:1.2.0]
	at org.apache.flink.streaming.runtime.operators.windowing.WindowOperator$Context.onEventTime(WindowOperator.java:721)
~[flink-streaming-java_2.11-1.2.0.jar:1.2.0]
	at org.apache.flink.streaming.runtime.operators.windowing.WindowOperator.onEventTime(WindowOperator.java:425)
~[flink-streaming-java_2.11-1.2.0.jar:1.2.0]
	at org.apache.flink.streaming.api.operators.HeapInternalTimerService.advanceWatermark(HeapInternalTimerService.java:276)
~[flink-streaming-java_2.11-1.2.0.jar:1.2.0]
	at org.apache.flink.streaming.api.operators.AbstractStreamOperator.processWatermark(AbstractStreamOperator.java:858)
~[flink-streaming-java_2.11-1.2.0.jar:1.2.0]
	at org.apache.flink.streaming.runtime.io.StreamInputProcessor.processInput(StreamInputProcessor.java:168)
~[flink-streaming-java_2.11-1.2.0.jar:1.2.0]
	at org.apache.flink.streaming.runtime.tasks.OneInputStreamTask.run(OneInputStreamTask.java:63)
~[flink-streaming-java_2.11-1.2.0.jar:1.2.0]
	at org.apache.flink.streaming.runtime.tasks.StreamTask.invoke(StreamTask.java:272) ~[flink-streaming-java_2.11-1.2.0.jar:1.2.0]
	at org.apache.flink.runtime.taskmanager.Task.run(Task.java:655) ~[flink-runtime_2.11-1.2.0.jar:1.2.0]
	at java.lang.Thread.run(Thread.java:745) ~[na:1.8.0_121]
{noformat}

It fails only with the Thread.sleep. If you uncomment it, it won't fail.
I know this is not a very rigourous test, but this is the only way I've found to reproduce
it.

You can find the reproducer here :
https://github.com/vpernin/flink-window-npe



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