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From "Jason Lowe (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-13362) DefaultMetricsSystem leaks the source name when a source unregisters
Date Mon, 01 Aug 2016 22:57:20 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-13362?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15402990#comment-15402990
] 

Jason Lowe commented on HADOOP-13362:
-------------------------------------

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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