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https://issues.apache.org/jira/browse/HDFS-5556?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13832055#comment-13832055
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Colin Patrick McCabe commented on HDFS-5556:
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cache is logically a per-cluster thing, not a per-namesystem thing. So I think
it does belong in NameNodeMXBean, just like getPercentUsed, etc.
I will check up on adding this to TestNameNodeMetrics
> add some more NameNode cache statistics, cache pool stats
> ---------------------------------------------------------
>
> Key: HDFS-5556
> URL: https://issues.apache.org/jira/browse/HDFS-5556
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Components: namenode
> Affects Versions: 3.0.0
> Reporter: Colin Patrick McCabe
> Assignee: Colin Patrick McCabe
> Attachments: HDFS-5556.001.patch, HDFS-5556.002.patch
>
>
> Add some more NameNode cache statistics and also cache pool statistics.
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