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https://issues.apache.org/jira/browse/HADOOP-13362?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15402990#comment-15402990
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Jason Lowe commented on HADOOP-13362:
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bq. any reason to not putting this patch to 2.7.3?
2.7.3 was in lockdown for only critical blockers that were preventing it from
being released, so I just committed it to branch-2.7. I'm OK with it going
into 2.7.3 if there's still a chance to do so, assuming the 2.7.3 release
manager is also OK with it.
> DefaultMetricsSystem leaks the source name when a source unregisters
> --------------------------------------------------------------------
>
> Key: HADOOP-13362
> URL: https://issues.apache.org/jira/browse/HADOOP-13362
> Project: Hadoop Common
> Issue Type: Bug
> Components: metrics
> Affects Versions: 2.7.2
> Reporter: Jason Lowe
> Assignee: Junping Du
> Priority: Critical
> Fix For: 2.7.4
>
> Attachments: HADOOP-13362-branch-2.7.patch
>
>
> Ran across a nodemanager that was spending most of its time in GC. Upon
> examination of the heap most of the memory was going to the map of names in
> org.apache.hadoop.metrics2.lib.UniqueNames. In this case the map had almost
> 2 million entries. Looking at a few of the map showed entries like
> "ContainerResource_container_e01_1459548490386_8560138_01_002020",
> "ContainerResource_container_e01_1459548490386_2378745_01_000410", etc.
> Looks like the ContainerMetrics for each container will cause a unique name
> to be registered with UniqueNames and the name will never be unregistered.
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