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From "Virag Kothari (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-11501) Metrics from JMX cache are not cleared
Date Fri, 11 Jul 2014 01:48:04 GMT

    [ https://issues.apache.org/jira/browse/HBASE-11501?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14058212#comment-14058212
] 

Virag Kothari commented on HBASE-11501:
---------------------------------------

Without the fix, the JmxCacheBusterRunnable is never called and metrics are not removed from
cache. With the fix, the metrics will be removed as the runnable will run and will stop the
metrics system (DefaultMetricsSystem.instance().stop()). However when it tries to start the
metrics system ( DefaultMetricsSystem.instance().start()), it cant register the mbeans with
the same name as before due to Hadoop-9559. This will cause the metrics system to even stop
publishing metrics.
So, running on hadoop 2.4 with this fix will do more harm than good. So either it should go
with hadoop 2.5 or if Hadoop-9559 is backported to 2.4 (and other versions if required), then
I believe this patch can go in before.


> Metrics from JMX cache are not cleared
> --------------------------------------
>
>                 Key: HBASE-11501
>                 URL: https://issues.apache.org/jira/browse/HBASE-11501
>             Project: HBase
>          Issue Type: Bug
>          Components: metrics
>    Affects Versions: 0.98.3
>            Reporter: Virag Kothari
>            Assignee: Virag Kothari
>         Attachments: HBASE-11501.patch, HBASE-11501.patch
>
>
> In JmxCacheBuster, clearJmxCache() has incorrect condition for starting JmxCacheBusterRunnable



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