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From "Swapan Shridhar (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (AMBARI-17818) Tez & Hive: Memory management should use scaled down Xmx for sizing buffers
Date Thu, 21 Jul 2016 21:41:20 GMT

    [ https://issues.apache.org/jira/browse/AMBARI-17818?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15388482#comment-15388482
] 

Swapan Shridhar commented on AMBARI-17818:
------------------------------------------

commits :

trunk:

{code}
commit 2516a059a7ca116d218bb6411fccd4ce11ad59ff
Author: Swapan Shridhar <sshridhar@hortonworks.com>
Date:   Thu Jul 21 14:35:38 2016 -0700

    AMBARI-17818. Tez & Hive: Memory management should use scaled down Xmx for sizing
buffers. (Gopal V via Swapan Shridhar)
{code}


branch-2.4:

{code}
commit 72d34c96ecf366d529ead19fffd5e52ef80aae42
Author: Swapan Shridhar <sshridhar@hortonworks.com>
Date:   Thu Jul 21 14:38:58 2016 -0700

    AMBARI-17818. Tez & Hive: Memory management should use scaled down Xmx for sizing
buffers. (Gopal V via Swapan Shridhar)
{code}

> 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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