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Posted to issues@ambari.apache.org by "Gopal V (JIRA)" <ji...@apache.org> on 2016/07/20 18:10:20 UTC

[jira] [Updated] (AMBARI-17818) Tez & Hive: Memory management should use scaled down Xmx for sizing buffers

     [ https://issues.apache.org/jira/browse/AMBARI-17818?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Gopal V updated AMBARI-17818:
-----------------------------
    Status: Patch Available  (was: Open)

> 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
>            Assignee: Gopal V
>         Attachments: AMBARI-17818.1.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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