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Flink Jira Bot commented on FLINK-3627: --------------------------------------- This major issue is unassigned and itself and all of its Sub-Tasks have not been updated for 30 days. So, it has been labeled "stale-major". If this ticket is indeed "major", please either assign yourself or give an update. Afterwards, please remove the label. In 7 days the issue will be deprioritized. > Task stuck on lock in StreamSource when cancelling > -------------------------------------------------- > > Key: FLINK-3627 > URL: https://issues.apache.org/jira/browse/FLINK-3627 > Project: Flink > Issue Type: Bug > Components: API / DataStream > Reporter: Jamie Grier > Priority: Major > Labels: hang, stale-major > > I've seen this occur a couple of times when the # of network buffers is set > too low. The job fails with the an appropriate message indicating that the > user should increase the # of network buffers. However, some of the task > threads then hang with a stack trace similar to the following. > 2016-03-16 13:38:54,017 WARN org.apache.flink.runtime.taskmanager.Task > - Task 'Source: EventGenerator -> (Flat Map, blah -> Filter -> > Projection -> Flat Map -> Timestamps/Watermarks -> Map) (46/144)' did not > react to cancelling signal, but is stuck in method: > > org.apache.flink.streaming.api.operators.StreamSource$ManualWatermarkContext.collect(StreamSource.java:317) > flink.benchmark.generator.LoadGeneratorSource.run(LoadGeneratorSource.java:38) > org.apache.flink.streaming.api.operators.StreamSource.run(StreamSource.java:78) > org.apache.flink.streaming.runtime.tasks.SourceStreamTask.run(SourceStreamTask.java:56) > org.apache.flink.streaming.runtime.tasks.StreamTask.invoke(StreamTask.java:224) > org.apache.flink.runtime.taskmanager.Task.run(Task.java:559) > java.lang.Thread.run(Thread.java:745) -- This message was sent by Atlassian Jira (v8.3.4#803005)