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From "Steve Loughran (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HADOOP-16248) MutableQuantiles leak memory under heavy load
Date Fri, 17 May 2019 14:31:00 GMT

     [ https://issues.apache.org/jira/browse/HADOOP-16248?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Steve Loughran updated HADOOP-16248:
------------------------------------
    Component/s: metrics

> MutableQuantiles leak memory under heavy load
> ---------------------------------------------
>
>                 Key: HADOOP-16248
>                 URL: https://issues.apache.org/jira/browse/HADOOP-16248
>             Project: Hadoop Common
>          Issue Type: Bug
>          Components: metrics
>    Affects Versions: 2.9.2
>            Reporter: Alexis Daboville
>            Assignee: Alexis Daboville
>            Priority: Major
>             Fix For: 3.0.4, 3.2.1, 2.9.3, 3.1.3
>
>         Attachments: HADOOP-16248.00.patch, 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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