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https://issues.apache.org/jira/browse/HBASE-10116?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13844542#comment-13844542
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Nick Dimiduk commented on HBASE-10116:
--------------------------------------
I'll point out that Oracle JDK6 (1.6.0_31 in my test) doesn't expose
"java.nio:type=BufferPool,name=direct", so
DirectMemoryUtils#getDirectMemoryUsage (and thus the change to
rs-status#memoryStats) reports 0 on that environment. This might be a point of
confusion for users.
> SlabCache metrics improvements
> ------------------------------
>
> Key: HBASE-10116
> URL: https://issues.apache.org/jira/browse/HBASE-10116
> Project: HBase
> Issue Type: Improvement
> Components: metrics, regionserver
> Reporter: Nick Dimiduk
> Assignee: Nick Dimiduk
> Priority: Minor
> Fix For: 0.98.0, 0.96.2, 0.99.0
>
> Attachments: HBASE-10116.00.patch
>
>
> SlabCache incorrectly reports block count and could do a better job reporting
> free size. MetricsRegionServerWrapperImpl incorrectly reports block cache
> count. Expose Direct Memory stats on RegionServer WebUI.
> Also clean up javadoc on BlockCache interface methods, and whitespace in
> cache-related classes.
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