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From "stack (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-10156) Fix up the HBASE-8755 slowdown when low contention
Date Fri, 03 Jan 2014 04:13:57 GMT

    [ https://issues.apache.org/jira/browse/HBASE-10156?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13861184#comment-13861184
] 

stack commented on HBASE-10156:
-------------------------------

[~xieliang007] Yeah.  Did more tests today.  For single thread, the patch is ~8% faster which
would take us about back to where we used to be for the single-threaded case.  For 250 threads,
we seem to be 50% faster with the patch.  BUT, for ten threads we are the same (the patch
is actually slightly slower by a few percent).  Let me figure what is going on here.  Also,
doing a dumb dfsclient write/sync/write/sync/write/sync and comparing, there is a big gap
between what it can do and what our WAL can do throughput-wise; our WAL has a way more going
on but am trying to see if there is any more to be milked here.

I'll clean up the patch and describe what it does better after I finish a few more experiments.

> Fix up the HBASE-8755 slowdown when low contention
> --------------------------------------------------
>
>                 Key: HBASE-10156
>                 URL: https://issues.apache.org/jira/browse/HBASE-10156
>             Project: HBase
>          Issue Type: Sub-task
>          Components: wal
>            Reporter: stack
>            Assignee: stack
>         Attachments: 10156.txt, 10156v2.txt, Disrupting.java
>
>
> HBASE-8755 slows our writes when only a few clients.  Fix.



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