[jira] [Created] (FLINK-8526) When use some parallelism, the program will stuck in some setting.

[Shang Yuanchun (Jira)]

zhu.qing created FLINK-8526:
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             Summary: When use some parallelism, the program will stuck in some setting.
                 Key: FLINK-8526
                 URL: https://issues.apache.org/jira/browse/FLINK-8526
             Project: Flink
          Issue Type: Bug
          Components: Cluster Management, Java API, Local Runtime
    Affects Versions: 1.4.0
         Environment: 8 machines(96GB and 24 cores)  and 20 taskslot per taskmanager. twitter-2010 dataset. And parallelism setting to 80. I run my code in standalone mode. 
            Reporter: zhu.qing
         Attachments: T2AdjActiveV.java, T2AdjMessage.java

The next program will stuck at some special parallelism in some situation. In the code attached. And I want to know the relation between parallelism and running task.When parallelism is 80. The program will always stuck. And when parallelism is 100. everything goes well. And I found when the parallelism equals to number of taskslots. The program is not fasted. And probably caused network buffer not enough. How networker buffer related to parallelism



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