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From "Andrew Purtell (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-6377) HBASE-5533 metrics miss all operations submitted via MultiAction
Date Thu, 12 Jul 2012 18:00:50 GMT

    [ https://issues.apache.org/jira/browse/HBASE-6377?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13413006#comment-13413006
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Andrew Purtell commented on HBASE-6377:
---------------------------------------

On trunk apparently all use of the "get", "put", and "delete" histograms have already been
removed from the regionserver, except for the Jamon templates. Since an approach to put back
two such HRegionInterface level measurements with a query/mutate distinction has been +1ed
on this issue I'm going to put them back on trunk and port back the changes to 0.94. Calling
them queryRequestLatency and mutateRequestLatency in RegionServerMetrics.
                
> HBASE-5533 metrics miss all operations submitted via MultiAction
> ----------------------------------------------------------------
>
>                 Key: HBASE-6377
>                 URL: https://issues.apache.org/jira/browse/HBASE-6377
>             Project: HBase
>          Issue Type: Bug
>          Components: metrics, regionserver
>    Affects Versions: 0.96.0, 0.94.1
>            Reporter: Andrew Purtell
>             Fix For: 0.94.2
>
>
> A client application (LoadTestTool) calls put() on HTables. Internally to the HBase client
those puts are batched into MultiActions. The total number of put operations shown in the
RegionServer's put metrics histogram never increases from 0 even though millions of such operations
are made. Needless to say the latency for those operations are not measured either. The value
of HBASE-5533 metrics are suspect given the client will batch put and delete ops like this.
> I had a fix in progress but HBASE-6284 messed it up. Before, MultiAction processing in
HRegionServer would distingush between puts and deletes and dispatch them separately. It was
easy to account for the time for them. Now both puts and deletes are submitted in batch together
as mutations.

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