[jira] [Created] (FLINK-3627) Task stuck on lock in StreamSource when cancelling

[Shang Yuanchun (Jira)]

Jamie Grier created FLINK-3627:
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             Summary: 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: Core
            Reporter: Jamie Grier


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)



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