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Posted to issues@tez.apache.org by "Rajesh Balamohan (JIRA)" <ji...@apache.org> on 2015/09/16 11:27:45 UTC

[jira] [Created] (TEZ-2834) tez app hangs at large scale (~30TB)

Rajesh Balamohan created TEZ-2834:
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             Summary: tez app hangs at large scale (~30TB)
                 Key: TEZ-2834
                 URL: https://issues.apache.org/jira/browse/TEZ-2834
             Project: Apache Tez
          Issue Type: Bug
    Affects Versions: 0.7.1
            Reporter: Rajesh Balamohan


Will attach the DAG.

Repro for reference: TPC-DS q_70 @ 30 TB scale.

"Map 7" completes in 2 waves. Output is very tiny, so reducer 8 gets launched slightly late.  But before "Reducer 9" can get scheduled, slots are taken up by "Map 1", which is not preempted for running "Reducer 9".



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