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https://issues.apache.org/jira/browse/HBASE-5179?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13189245#comment-13189245
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stack commented on HBASE-5179:
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So your thinking is that we'd go local in case a distributed log splitting is
already going on? That would work for the case where say ten servers went down
around same time and the tenth queued had meta on it. But then, what if there
is no distributed log splitting going on? Master-only log splitting would be
slower than distributed splitting?
> 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: 0.92.0, 0.94.0, 0.90.6
>
> Attachments: 5179-90.txt, 5179-90v10.patch, 5179-90v11.patch,
> 5179-90v12.patch, 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-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-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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