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https://issues.apache.org/jira/browse/HDFS-7182?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14252553#comment-14252553
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Ming Ma commented on HDFS-7182:
-------------------------------
Anyone else has suggestions on this? The patch has been running fine in one of
our production clusters.
> JMX metrics aren't accessible when NN is busy
> ---------------------------------------------
>
> Key: HDFS-7182
> URL: https://issues.apache.org/jira/browse/HDFS-7182
> Project: Hadoop HDFS
> Issue Type: Improvement
> Reporter: Ming Ma
> Assignee: Ming Ma
> Attachments: HDFS-7182.patch
>
>
> HDFS-5693 has addressed all NN JMX metrics in hadoop 2.0.5. Since then couple
> new metrics have been added. It turns out "RollingUpgradeStatus" requires
> FSNamesystem read lock.
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