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https://issues.apache.org/jira/browse/HIVE-15959?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15872423#comment-15872423
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Siddharth Seth commented on HIVE-15959:
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The code that has been moved from package.py to the ServiceDriver - package.py
was heapSize*1.2. Java is using *2
Computing the headroom in the daemon.
Didn't understand this part (will be 0 very often)
{code}
return Math.max(0, minHeadRoom - headRoom);
{code}
There's normally a 6+GB headroom between (xmx + cache) and container-size - to
account for off heap allocations.
This headroom was to carve out a part of the heap for llap data structures, and
the cache. Think the simples would be to take the configured value (5%) and use
that with JVM.maxAvailable.
> LLAP: fix headroom calculation and move it to daemon
> ----------------------------------------------------
>
> Key: HIVE-15959
> URL: https://issues.apache.org/jira/browse/HIVE-15959
> Project: Hive
> Issue Type: Bug
> Reporter: Sergey Shelukhin
> Assignee: Sergey Shelukhin
> Attachments: HIVE-15959.patch
>
>
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