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Posted to common-issues@hadoop.apache.org by "Steve Loughran (JIRA)" <ji...@apache.org> on 2019/05/08 13:08:01 UTC
[jira] [Updated] (HADOOP-16248) Fix MutableQuantiles memory leak
[ https://issues.apache.org/jira/browse/HADOOP-16248?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Steve Loughran updated HADOOP-16248:
------------------------------------
Status: Patch Available (was: Open)
> 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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