Avihai Berkovitz created FLINK-4631:

             Summary: NullPointerException during stream task cleanup
                 Key: FLINK-4631
                 URL: https://issues.apache.org/jira/browse/FLINK-4631
             Project: Flink
          Issue Type: Bug
    Affects Versions: 1.1.2
         Environment: Ubuntu server 12.04.5 64 bit
java version "1.8.0_40"
Java(TM) SE Runtime Environment (build 1.8.0_40-b26)
Java HotSpot(TM) 64-Bit Server VM (build 25.40-b25, mixed mode)
            Reporter: Avihai Berkovitz

If a streaming job failed during startup (in my case, due to lack of network 
buffers), all the tasks are being cancelled before they started. This causes 
many instances of the following exception:
2016-09-18 14:17:12,177 ERROR 
org.apache.flink.streaming.runtime.tasks.StreamTask           - Error during 
cleanup of stream task
        at org.apache.flink.runtime.taskmanager.Task.run(Task.java:584)
        at java.lang.Thread.run(Thread.java:745)

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