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https://issues.apache.org/jira/browse/HADOOP-16248?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16835586#comment-16835586
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Hadoop QA commented on HADOOP-16248:
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| (x) *{color:red}-1 overall{color}* |
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|| Vote || Subsystem || Runtime || Comment ||
| {color:blue}0{color} | {color:blue} reexec {color} | {color:blue} 0m
0s{color} | {color:blue} Docker mode activated. {color} |
| {color:red}-1{color} | {color:red} patch {color} | {color:red} 0m 6s{color}
| {color:red} HADOOP-16248 does not apply to trunk. Rebase required? Wrong
Branch? See https://wiki.apache.org/hadoop/HowToContribute for help. {color} |
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|| Subsystem || Report/Notes ||
| JIRA Issue | HADOOP-16248 |
| Console output |
https://builds.apache.org/job/PreCommit-HADOOP-Build/16237/console |
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This message was automatically generated.
> Fix MutableQuantiles memory leak
> --------------------------------
>
> Key: HADOOP-16248
> URL: https://issues.apache.org/jira/browse/HADOOP-16248
> Project: Hadoop Common
> Issue Type: Bug
> Affects Versions: 2.9.2
> Reporter: Alexis Daboville
> Priority: Major
> Attachments: mutable-quantiles-leak.png, mutable-quantiles.patch
>
>
> In some circumstances (high GC, high CPU usage, creating lots of
> S3AFileSystem) it is possible for MutableQuantiles::scheduler [1] to fall
> behind processing tasks that are submitted to it; because tasks are
> submitted on a regular schedule, the unbounded queue backing the
> {{ExecutorService}} might grow to several gigs [2]. By using
> {{scheduleWithFixedDelay}} instead, we ensure that under pressure this leak
> won't
> happen. In order to mitigate the growth, a simple fix [3] is proposed,
> simply replacing {{scheduler.scheduleAtFixedRate}} by
> {{scheduler.scheduleWithFixedDelay}}.
> [1] it is single threaded and shared across all instances of
> {{MutableQuantiles}}:
> [https://github.com/apache/hadoop/blob/trunk/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/metrics2/lib/MutableQuantiles.java#L66-L68]
> [2] see attached mutable-quantiles-leak.png.
> [3] mutable-quantiles.patch
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