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Posted to dev@tez.apache.org by "Jason Lowe (JIRA)" <ji...@apache.org> on 2018/04/02 21:03:00 UTC

[jira] [Created] (TEZ-3909) DAG can hang if vertex with no tasks is killed

Jason Lowe created TEZ-3909:
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             Summary: DAG can hang if vertex with no tasks is killed
                 Key: TEZ-3909
                 URL: https://issues.apache.org/jira/browse/TEZ-3909
             Project: Apache Tez
          Issue Type: Bug
    Affects Versions: 0.9.0
            Reporter: Jason Lowe
            Assignee: Jason Lowe


If a vertex with no tasks is killed just as it is starting then the vertex can fail to reach a terminal state if the terminate event arrives while the vertex is still in the RUNNING state.  The terminate moves it to the TERMINATING state which ignores the V_COMPLETED event that later arrives.  Once it drops the completed event, no other event will kick it out of the TERMINATING state and the DAG hangs forever waiting for all vertices to complete.



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