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Bharat Viswanadham edited comment on HADOOP-16248 at 5/16/19 1:06 AM: ---------------------------------------------------------------------- Hi [~adaboville] You can create a patch with below format. <<JiraNo>>.<<PatchVersion>>.patch. In your case, it will be HADOOP-16248.00.pathc was (Author: bharatviswa): Hi [~adaboville] You can create a patch with below format. <<JiraNo>>.<<PatchVersion>>.patch > 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 -- This message was sent by Atlassian JIRA (v7.6.3#76005) --------------------------------------------------------------------- To unsubscribe, e-mail: common-issues-unsubscr...@hadoop.apache.org For additional commands, e-mail: common-issues-h...@hadoop.apache.org