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https://issues.apache.org/jira/browse/HBASE-5533?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13291318#comment-13291318
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Zhihong Ted Yu commented on HBASE-5533:
---------------------------------------
I saw a lot of the following in test output
(https://builds.apache.org/view/G-L/view/HBase/job/HBase-TRUNK/3000/testReport/org.apache.hadoop.hbase.regionserver/TestSplitTransactionOnCluster/testShutdownFixupWhenDaughterHasSplit/):
{code}
2012-06-07 18:33:14,623 ERROR
[RegionServer:0;juno.apache.org,39424,1339093992166]
util.MetricsDynamicMBeanBase(116): unknown metrics type:
org.apache.hadoop.hbase.metrics.histogram.MetricsHistogram
{code}
> Add more metrics to HBase
> -------------------------
>
> Key: HBASE-5533
> URL: https://issues.apache.org/jira/browse/HBASE-5533
> Project: HBase
> Issue Type: Improvement
> Affects Versions: 0.92.2, 0.94.0
> Reporter: Shaneal Manek
> Assignee: Shaneal Manek
> Priority: Minor
> Fix For: 0.92.2, 0.94.0, 0.96.0
>
> Attachments: BlockingQueueContention.java, HBASE-5533-0.92-v4.patch,
> HBASE-5533-TRUNK-v6.patch, HBASE-5533-TRUNK-v6.patch,
> HBASE-5533-v7-0.92.patch, TimingOverhead.java, hbase-5533-0.92.patch,
> hbase5533-0.92-v2.patch, hbase5533-0.92-v3.patch, hbase5533-0.92-v5.patch,
> histogram_web_ui.png
>
>
> To debug/monitor production clusters, there are some more metrics I wish I
> had available.
> In particular:
> - Although the average FS latencies are useful, a 'histogram' of recent
> latencies (90% of reads completed in under 100ms, 99% in under 200ms, etc)
> would be more useful
> - Similar histograms of latencies on common operations (GET, PUT, DELETE)
> would be useful
> - Counting the number of accesses to each region to detect hotspotting
> - Exposing the current number of HLog files
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