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From "Junping Du (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-13362) DefaultMetricsSystem leaks the source name when a source unregisters
Date Mon, 11 Jul 2016 15:13:11 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-13362?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15370943#comment-15370943
] 

Junping Du commented on HADOOP-13362:
-------------------------------------

bq. The metrics are getting cleaned up in the monitoring thread's run() method.
I see. The monitor thread code of run() is significantly different with trunk now so I missed
that before.

Put a patch to include hadoop-common fix only (with test in TestContainerMetrics).


> 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
>
> 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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