[jira] [Assigned] (HIVE-20951) LLAP: Set Xms to 50% always

["Gopal V (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HIVE-20951?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Gopal V reassigned HIVE-20951:
------------------------------

    Assignee: Gopal V

> LLAP: Set Xms to 50% always 
> ----------------------------
>
>                 Key: HIVE-20951
>                 URL: https://issues.apache.org/jira/browse/HIVE-20951
>             Project: Hive
>          Issue Type: Bug
>          Components: llap
>    Affects Versions: 4.0.0, 3.1.1
>            Reporter: Gopal V
>            Assignee: Gopal V
>            Priority: Major
>
> The lack of GC pauses is killing LLAP containers whenever the significant amount of memory is consumed by the off-heap structures which aren't cleaned up automatically until the GC runs.
> There's a java.nio.DirectByteBuffer.Deallocator which runs when the Direct buffers are garbage collected, which actually does the cleanup of the underlying off-heap buffers.
> The lack of Garbage collection activity for several hours while responding to queries triggers a build-up of these off-heap structures which end up forcing YARN to kill the process instead.
> It is better to hit a GC pause occasionally rather than to lose a node every few hours.



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