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https://issues.apache.org/jira/browse/HIVE-20951?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16702520#comment-16702520
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Gopal V commented on HIVE-20951:
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[~bslim]: this is already off-heap and mostly allocated by other systems like
java NIO.
I suspect we'll end up fixing it via the -D parameter once we go to JDK11
https://bugs.java.com/bugdatabase/view_bug.do?bug_id=JDK-8147468
> 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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