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From "chunhui shen (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-5179) Concurrent processing of processFaileOver and ServerShutdownHandler may cause region to be assigned before log splitting is completed, causing data loss
Date Sat, 28 Jan 2012 10:17:10 GMT

    [ https://issues.apache.org/jira/browse/HBASE-5179?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13195478#comment-13195478
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chunhui shen commented on HBASE-5179:
-------------------------------------

@ram
Yes, we will test the 90patch after Chinese spring holidays.
                
> Concurrent processing of processFaileOver and ServerShutdownHandler may cause region
to be assigned before log splitting is completed, causing data loss
> --------------------------------------------------------------------------------------------------------------------------------------------------------
>
>                 Key: HBASE-5179
>                 URL: https://issues.apache.org/jira/browse/HBASE-5179
>             Project: HBase
>          Issue Type: Bug
>          Components: master
>    Affects Versions: 0.90.2
>            Reporter: chunhui shen
>            Assignee: chunhui shen
>            Priority: Critical
>             Fix For: 0.94.0, 0.90.7, 0.92.1
>
>         Attachments: 5179-90.txt, 5179-90v10.patch, 5179-90v11.patch, 5179-90v12.patch,
5179-90v13.txt, 5179-90v14.patch, 5179-90v15.patch, 5179-90v16.patch, 5179-90v17.txt, 5179-90v18.txt,
5179-90v2.patch, 5179-90v3.patch, 5179-90v4.patch, 5179-90v5.patch, 5179-90v6.patch, 5179-90v7.patch,
5179-90v8.patch, 5179-90v9.patch, 5179-92v17.patch, 5179-v11-92.txt, 5179-v11.txt, 5179-v2.txt,
5179-v3.txt, 5179-v4.txt, Errorlog, hbase-5179.patch, hbase-5179v10.patch, hbase-5179v12.patch,
hbase-5179v17.patch, hbase-5179v5.patch, hbase-5179v6.patch, hbase-5179v7.patch, hbase-5179v8.patch,
hbase-5179v9.patch
>
>
> If master's processing its failover and ServerShutdownHandler's processing happen concurrently,
it may appear following  case.
> 1.master completed splitLogAfterStartup()
> 2.RegionserverA restarts, and ServerShutdownHandler is processing.
> 3.master starts to rebuildUserRegions, and RegionserverA is considered as dead server.
> 4.master starts to assign regions of RegionserverA because it is a dead server by step3.
> However, when doing step4(assigning region), ServerShutdownHandler may be doing split
log, Therefore, it may cause data loss.

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