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https://issues.apache.org/jira/browse/HBASE-5179?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13206615#comment-13206615
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chunhui shen commented on HBASE-5179:
-------------------------------------
@ram
We didn't find any problem now with the patch in 0.90 version testing,
but as the comment by Stack in HBASE-5270, maybe we could use a new method, so
i'm not sure whether to change the solution
> 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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