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From "Jeffrey Zhong (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-7006) [MTTR] Study distributed log splitting to see how we can make it faster
Date Tue, 12 Feb 2013 00:23:13 GMT

    [ https://issues.apache.org/jira/browse/HBASE-7006?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13576244#comment-13576244
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Jeffrey Zhong commented on HBASE-7006:
--------------------------------------


The big table approach is kind of middle ground approach between the existing implementation
and the proposal in the JIRA. The file block implementation seems need more work though. Each
region server has to read all those newly created block files to replay edits but cut writes
significantly so it should have improvements over existing approach(not the new proposal as
it still read recovery data twice: one is in log splitting and the other is in replay phase
and incur some extra writes).

Thanks,
-Jeffrey

 
                
> [MTTR] Study distributed log splitting to see how we can make it faster
> -----------------------------------------------------------------------
>
>                 Key: HBASE-7006
>                 URL: https://issues.apache.org/jira/browse/HBASE-7006
>             Project: HBase
>          Issue Type: Bug
>            Reporter: stack
>            Assignee: Jeffrey Zhong
>             Fix For: 0.96.0
>
>         Attachments: LogSplitting Comparison.pdf, ProposaltoimprovelogsplittingprocessregardingtoHBASE-7006.pdf
>
>
> Just saw interesting issue where a cluster went down  hard and 30 nodes had 1700 WALs
to replay.  Replay took almost an hour.  It looks like it could run faster that much of the
time is spent zk'ing and nn'ing.
> Putting in 0.96 so it gets a look at least.  Can always punt.

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