Oriol Orellana created FLINK-5717:
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Summary: NPE on SessionWindows with ContinuousProcessingTimeTrigger
Key: FLINK-5717
URL:
https://issues.apache.org/jira/browse/FLINK-5717 Project: Flink
Issue Type: Bug
Components: DataStream API
Affects Versions: 1.1.4, 2.0.0
Reporter: Oriol Orellana
The same bug as
https://issues.apache.org/jira/browse/FLINK-4862, but for ContinuousProcessingTimeTrigger. I copied the description from that same issue.
*what's the error?*
The following NPE error is thrown when SessionWindows with ContinuousProcessingTimeTrigger is used.
{code:borderStyle=solid}
Caused by: java.lang.NullPointerException
at org.apache.flink.streaming.api.windowing.triggers.ContinuousProcessingTimeTrigger.clear(ContinuousProcessingTimeTrigger.java:91)
at org.apache.flink.streaming.runtime.operators.windowing.WindowOperator$Context.clear(WindowOperator.java:768)
at org.apache.flink.streaming.runtime.operators.windowing.WindowOperator$2.merge(WindowOperator.java:310)
at org.apache.flink.streaming.runtime.operators.windowing.WindowOperator$2.merge(WindowOperator.java:297)
at org.apache.flink.streaming.runtime.operators.windowing.MergingWindowSet.addWindow(MergingWindowSet.java:196)
at org.apache.flink.streaming.runtime.operators.windowing.WindowOperator.processElement(WindowOperator.java:297)
at org.apache.flink.streaming.runtime.io.StreamInputProcessor.processInput(StreamInputProcessor.java:183)
at org.apache.flink.streaming.runtime.tasks.OneInputStreamTask.run(OneInputStreamTask.java:66)
at org.apache.flink.streaming.runtime.tasks.StreamTask.invoke(StreamTask.java:271)
at org.apache.flink.runtime.taskmanager.Task.run(Task.java:609)
at java.lang.Thread.run(Thread.java:745)
{code:borderStyle=solid}
*how to reproduce ?*
use ContinuousProcessingTimeTrigger instead of the default EventTimeTrigger in SessionWindowing example.
*what's the cause ?*
When two session windows are being merged, the states of the two ContinuousEventTimeTrigger are merged as well and the new namespace is the merged window. Later when the context tries to delete Timer from the old trigger and looks up the timestamp by the old namespace, null value is returned.
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