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https://issues.apache.org/jira/browse/AMBARI-17818?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15388434#comment-15388434
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Sumit Mohanty commented on AMBARI-17818:
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LGTM, +1
> 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
> Components: stacks
> Reporter: Gopal V
> Assignee: Gopal V
> Attachments: AMBARI-17818.1.patch, AMBARI-17818.2.patch
>
>
> 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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