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From "stack (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-5533) Add more metrics to HBase
Date Fri, 23 Mar 2012 05:44:30 GMT

    [ https://issues.apache.org/jira/browse/HBASE-5533?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13236357#comment-13236357
] 

stack commented on HBASE-5533:
------------------------------

The above is all good.  I'm not sure how to deprecate a metric.  I've not done that before.
 We could just turn them off or emit the new stuff on the old metric name too (which seems
silly).  If the new are superior, we should just replace the old w/ the new?  Would that be
hard to do Shaneal?
                
> 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
>         Attachments: BlockingQueueContention.java, HBASE-5533-0.92-v4.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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