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https://issues.apache.org/jira/browse/HBASE-5179?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13195429#comment-13195429
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ramkrishna.s.vasudevan commented on HBASE-5179:
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@Chunhui
Are you using 0.90.x in your cluster? If so, Can you test this patch before we
commit it into 0.90? We have done some testing and next week after Chinese
spring holidays we will do some more testing.
If we are confident then we can commit this and will prevent Stack from
searching us with hammer :)
> 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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