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From "Elliott Clark (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-5786) Implement histogram metrics for flush and compaction latencies and sizes.
Date Tue, 19 Jun 2012 16:03:42 GMT

    [ https://issues.apache.org/jira/browse/HBASE-5786?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13396880#comment-13396880

Elliott Clark commented on HBASE-5786:

I actually think that most metrics should go toward histograms rather than TimeVaryingRate
.  Others have mentioned that an average is not really useful when hbase is the primary data
store of a live website/app.  That use case is much more interested in the 75/95/99th percentile.
 Once HBASE-6211 is in I can take this up.  Maybe with some of the metrics refactor that Lars
is talking about.
> Implement histogram metrics for flush and compaction latencies and sizes.
> -------------------------------------------------------------------------
>                 Key: HBASE-5786
>                 URL: https://issues.apache.org/jira/browse/HBASE-5786
>             Project: HBase
>          Issue Type: New Feature
>          Components: metrics, regionserver
>    Affects Versions: 0.92.2, 0.94.0, 0.96.0
>            Reporter: Jonathan Hsieh
> Average time for region operations doesn't really tell a useful story when that help
diagnose anomalous conditions.
> It would be extremely useful to add histogramming metrics similar to HBASE-5533 for region
operations like flush, compaction and splitting.  The probably should be forward biased at
a much coarser granularity however (maybe decay every day?) 

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