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From "Shaneal Manek (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-5533) Add more metrics to HBase
Date Sat, 24 Mar 2012 02:01:26 GMT

    [ https://issues.apache.org/jira/browse/HBASE-5533?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13237406#comment-13237406
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Shaneal Manek commented on HBASE-5533:
--------------------------------------

Ah, upon further examination, I realized I initially misunderstood what that those HRegion
metrics you pointed out were doing. They are calculating statistics on a per-CF basis (HBASE-4219),
while I thought they were per-RS. Unfortunately, that means they don't overlap like I thought
they did.

I've attached a new patch that applies to TRUNK.
                
> 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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