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From "Jeffrey Zhong (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-7006) [MTTR] Improve Region Server Recovery Time - Distributed Log Replay
Date Wed, 05 Jun 2013 23:25:25 GMT

    [ https://issues.apache.org/jira/browse/HBASE-7006?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13676479#comment-13676479
] 

Jeffrey Zhong commented on HBASE-7006:
--------------------------------------

A small correction for option three: {quote}a worker will only pick WAL2 if WAL1 is done(or
errored) etc.{quote} should be {quote}a worker will only pick WAL2 if WAL1 is taken by another
worker{quote}

                
> [MTTR] Improve Region Server Recovery Time - Distributed Log Replay
> -------------------------------------------------------------------
>
>                 Key: HBASE-7006
>                 URL: https://issues.apache.org/jira/browse/HBASE-7006
>             Project: HBase
>          Issue Type: New Feature
>          Components: MTTR
>            Reporter: stack
>            Assignee: Jeffrey Zhong
>            Priority: Critical
>             Fix For: 0.98.0, 0.95.1
>
>         Attachments: 7006-addendum-3.txt, hbase-7006-addendum.patch, hbase-7006-combined.patch,
hbase-7006-combined-v1.patch, hbase-7006-combined-v4.patch, hbase-7006-combined-v5.patch,
hbase-7006-combined-v6.patch, hbase-7006-combined-v7.patch, hbase-7006-combined-v8.patch,
hbase-7006-combined-v9.patch, LogSplitting Comparison.pdf, ProposaltoimprovelogsplittingprocessregardingtoHBASE-7006-v2.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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