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From "Gopal V (JIRA)" <j...@apache.org>
Subject [jira] [Created] (AMBARI-17818) Tez & Hive: Memory management should use scaled down Xmx for sizing buffers
Date Wed, 20 Jul 2016 17:44:20 GMT
Gopal V created AMBARI-17818:
--------------------------------

             Summary: Tez & Hive: Memory management should use scaled down Xmx for sizing
buffers
                 Key: AMBARI-17818
                 URL: https://issues.apache.org/jira/browse/AMBARI-17818
             Project: Ambari
          Issue Type: Bug
            Reporter: Gopal V


The defaults in Ambari assume 80% of the YARN container size is allocate to the user heap
(Xmx).

On top of this particular restriction, the allocation blocks are divided into Eden/Survivor/Tenured
- a single allocation spanning 40% of the heap might fail for tez runtime.io.sort.mb.

Scale down the Tez sort size and map join by 0.8x to match Xmx.



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