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Date: Sat, 23 Nov 2013 02:07:36 +0000 (UTC)
From: "Jeffrey Zhong (JIRA)" <jira@apache.org>
To: issues@hbase.apache.org
Message-ID: <JIRA.12673101.1381348651830.17965.1385172456064@arcas>
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Subject: [jira] [Commented] (HBASE-9736) Alow more than one log splitter per
 RS
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    [ https://issues.apache.org/jira/browse/HBASE-9736?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13830517#comment-13830517 ] 

Jeffrey Zhong commented on HBASE-9736:
--------------------------------------

Thanks @Stack for the comments! I'll incorporate your comments after feedbacks from your test run.

> Alow more than one log splitter per RS
> --------------------------------------
>
>                 Key: HBASE-9736
>                 URL: https://issues.apache.org/jira/browse/HBASE-9736
>             Project: HBase
>          Issue Type: Improvement
>          Components: MTTR
>            Reporter: stack
>            Assignee: Jeffrey Zhong
>            Priority: Critical
>         Attachments: hbase-9736.patch
>
>
> IIRC, this is an idea that came from the lads at Xiaomi.
> I have a small cluster of 6 RSs and one went down.  It had a few WALs.  I see this in logs:
> 2013-10-09 05:47:27,890 DEBUG org.apache.hadoop.hbase.master.SplitLogManager: total tasks = 25 unassigned = 21
> WAL splitting is held up for want of slots out on the cluster to split WALs.
> We need to be careful we don't overwhelm the foreground regionservers but more splitters should help get all back online faster.


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