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Date: Wed, 30 May 2012 08:23:23 +0000 (UTC)
From: "chunhui shen (JIRA)" <jira@apache.org>
To: issues@hbase.apache.org
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Subject: [jira] [Commented] (HBASE-6134) Speed up distribued split log
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    [ https://issues.apache.org/jira/browse/HBASE-6134?page=3Dcom.atlassian=
.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=3D1328=
5496#comment-13285496 ]=20

chunhui shen commented on HBASE-6134:
-------------------------------------

@ted

In my opition, we could do the improvement for split-worker.


In the patch , I change the split logic which executed by the split-worker =
same as local-master-split.

It means, there are multi threads to creater writer and append hlog entry.

Also, we found closing writer is quite slow, so make the closeStreams() exe=
cuted by multi threads.

With the patch, we test the time of distribued split log again, and reduce =
the time from 165s+ to 38s+
(34hlog files 4 regionervers)
               =20
> Speed up distribued split log
> -----------------------------
>
>                 Key: HBASE-6134
>                 URL: https://issues.apache.org/jira/browse/HBASE-6134
>             Project: HBase
>          Issue Type: Improvement
>          Components: wal
>            Reporter: chunhui shen
>            Assignee: chunhui shen
>             Fix For: 0.96.0
>
>         Attachments: HBASE-6134.patch
>
>
> First=EF=BC=8Cwe do the test between local-master-split and distributed s=
plit log
> Environment=EF=BC=9A34 hlog files, 5 regionservers,(after kill one, only =
4 rs do ths splitting work)
> local-master-split:60s+
> distributed-split-log:165s+
> In fact, in our production environment, distributed-split-log also took 6=
0s with 30 regionservers for 34 hlog files (regionserver may be in high loa=
d)
> We found split-worker split one log file took about 20s.
> I think we should do the improvement for this.

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