Siddharth Seth created TEZ-3128:
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             Summary: Avoid stopping containers on the AM shutdown thread
                 Key: TEZ-3128
                 URL: https://issues.apache.org/jira/browse/TEZ-3128
             Project: Apache Tez
          Issue Type: Bug
    Affects Versions: 0.8.0-alpha
            Reporter: Siddharth Seth


During an AM shutdown, the TaskCommunicator is also shutdown and it tries to 
stop containers in the shutdown thread itself. This can cause the AM shutdown 
to block if NMs are not available.

This likely affects 0.7 as well.



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