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Posted to issues@tez.apache.org by "Jason Lowe (JIRA)" <ji...@apache.org> on 2016/10/25 15:26:59 UTC

[jira] [Created] (TEZ-3491) Tez job can hang due to container priority inversion

Jason Lowe created TEZ-3491:
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             Summary: Tez job can hang due to container priority inversion
                 Key: TEZ-3491
                 URL: https://issues.apache.org/jira/browse/TEZ-3491
             Project: Apache Tez
          Issue Type: Bug
    Affects Versions: 0.7.1
            Reporter: Jason Lowe
            Priority: Critical


If the Tez AM receives containers at a lower priority than the highest priority task being requested then it fails to assign the container to any task.  In addition if the container is new then it refuses to release it if there are any pending tasks.  If it takes too long for the higher priority requests to be fulfilled (e.g.: the lower priority containers are filling the queue) then eventually YARN will expire the unused lower priority containers since they were never launched.  The Tez AM then never re-requests these lower priority containers and the job hangs because the AM is waiting for containers from the RM that the RM already sent and expired.



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