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https://issues.apache.org/jira/browse/HADOOP-14329?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15975682#comment-15975682
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Andrew Wang commented on HADOOP-14329:
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[~xyao] could you take a look at this? Looks like this class was added by
HDFS-10917 which you worked on.
> 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
> Priority: Minor
> Labels: newbie
>
> 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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