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From "cuijianwei (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-10129) support real time rpc invoke latency percentile statistics for methods of HRegionInterface
Date Thu, 19 Dec 2013 03:59:07 GMT

    [ https://issues.apache.org/jira/browse/HBASE-10129?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13852581#comment-13852581
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cuijianwei commented on HBASE-10129:
------------------------------------

To evaluate the performance change, I use the test tool YCSB to put/get 10,000,000 records
to a cluster containing 5 region servers, then I compare the average latency respectively.

For cluster without the patch, I get the put/get latency:
[PUT], AverageLatency(us), 953.5947375
[GET], AverageLatency(us), 279.0727035
For cluster with the patch, I get the put/get latency:
[PUT], AverageLatency(us), 954.3327765
[GET], AverageLatency(us), 248.4747838
It seems the performance change when applying the patch is not significant.

> support real time rpc invoke latency percentile statistics for methods of HRegionInterface

> -------------------------------------------------------------------------------------------
>
>                 Key: HBASE-10129
>                 URL: https://issues.apache.org/jira/browse/HBASE-10129
>             Project: HBase
>          Issue Type: Improvement
>          Components: regionserver
>    Affects Versions: 0.94.14
>            Reporter: cuijianwei
>         Attachments: HBASE-10129-0.94-v1.patch
>
>
> It is important for applications to get latency statistics when invoking hbase apis.
Currently, the average latency of methods in HRegionInterface will be computed in HBaseRpcMetrics.
However, user might expect more detail latency statistics, such as 75% percentile latency,
95% percentile latency, etc. Therefore, will it be useful if we computing latency percentiles
for rpc invoking of region server methods? 



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