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From "Arpit Agarwal (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-14329) Thread leakage in Hadoop RollingAverages metric collection
Date Thu, 20 Apr 2017 19:32:04 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-14329?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15977323#comment-15977323

Arpit Agarwal commented on HADOOP-14329:

Thanks. It doesn't look like a leak to me. The ScheduledExecutorService is shared across all
RollingAverages instances so it makes sense for it to persist until process termination.

Does your Solr test have exceptions for pre-existing classes with the same behavior e.g. MutableQuantiles?

> Thread leakage in Hadoop RollingAverages metric collection
> ----------------------------------------------------------
>                 Key: HADOOP-14329
>                 URL: https://issues.apache.org/jira/browse/HADOOP-14329
>             Project: Hadoop Common
>          Issue Type: Bug
>          Components: metrics
>    Affects Versions: 3.0.0-alpha2
>            Reporter: Hrishikesh Gadre
>            Assignee: Chen Liang
>            Priority: Minor
>              Labels: newbie
>         Attachments: HADOOP-14329.001.patch
> The rolling averages metric implementation defines a static ScheduledExecutorService
instance which is not shutdown properly. This results in leaking the corresponding thread.
This issue was identified while testing Solr/Hadoop 3 integration.
> Here is the relevant portion of the code involved,
> https://github.com/apache/hadoop/blob/c1549352cf1d1b1b45d7b613f993d45649b8efcf/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/metrics2/lib/RollingAverages.java#L65

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