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From "stack (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HBASE-576) Investigate IPC performance
Date Tue, 07 Oct 2008 17:48:44 GMT

    [ https://issues.apache.org/jira/browse/HBASE-576?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12637562#action_12637562
] 

stack commented on HBASE-576:
-----------------------------

Below numbers are for cluster of three regionservers w/ client running on master -- which
was not running regionserver.

482/s w/ 1 thread
936/s w/ 3 threads
1092/s w/ 4 threads
1531/s w/ 8 threads
1782/s w/ 16 threads

My cluster is small.  That probably has something to do w/ why the less-than-linear progress.

> Investigate IPC performance
> ---------------------------
>
>                 Key: HBASE-576
>                 URL: https://issues.apache.org/jira/browse/HBASE-576
>             Project: Hadoop HBase
>          Issue Type: Improvement
>          Components: ipc
>    Affects Versions: 0.1.0, 0.1.1, 0.1.2, 0.2.0
>            Reporter: Jim Kellerman
>            Assignee: stack
>         Attachments: htd.patch, pe.patch
>
>
> Turning off all file I/O, and running the PerformanceEvaluation test, of 1,048,576 sequential
writes to HBase managed to achieve only 7,285 IPCs per second.
> Running PerformanceEvaluation sequential write test modified to do an abort instead of
a commit, it was possible to do 68,337 operations per second. We are obviously spending a
lot of time doing IPCs. 
> We need to investigate to find the bottleneck. Marshalling and unmarshalling? Socket
setup and teardown?

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