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https://issues.apache.org/jira/browse/HIVE-20951?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16702583#comment-16702583
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Hive QA commented on HIVE-20951:
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| (/) *{color:green}+1 overall{color}* |
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|| Vote || Subsystem || Runtime || Comment ||
|| || || || {color:brown} Prechecks {color} ||
| {color:green}+1{color} | {color:green} @author {color} | {color:green} 0m
0s{color} | {color:green} The patch does not contain any @author tags. {color} |
|| || || || {color:brown} master Compile Tests {color} ||
|| || || || {color:brown} Patch Compile Tests {color} ||
| {color:green}+1{color} | {color:green} whitespace {color} | {color:green} 0m
0s{color} | {color:green} The patch has no whitespace issues. {color} |
|| || || || {color:brown} Other Tests {color} ||
| {color:green}+1{color} | {color:green} asflicense {color} | {color:green} 0m
31s{color} | {color:green} The patch does not generate ASF License warnings.
{color} |
| {color:black}{color} | {color:black} {color} | {color:black} 1m 5s{color} |
{color:black} {color} |
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|| Subsystem || Report/Notes ||
| Optional Tests | asflicense |
| uname | Linux hiveptest-server-upstream 3.16.0-4-amd64 #1 SMP Debian
3.16.36-1+deb8u1 (2016-09-03) x86_64 GNU/Linux |
| Build tool | maven |
| Personality |
/data/hiveptest/working/yetus_PreCommit-HIVE-Build-15104/dev-support/hive-personality.sh
|
| git revision | master / a070a9d |
| modules | C: llap-server U: llap-server |
| Console output |
http://104.198.109.242/logs//PreCommit-HIVE-Build-15104/yetus.txt |
| Powered by | Apache Yetus http://yetus.apache.org |
This message was automatically generated.
> 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
> Attachments: HIVE-20951.1.patch
>
>
> 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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