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https://issues.apache.org/jira/browse/HBASE-5179?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13186208#comment-13186208
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gaojinchao commented on HBASE-5179:
-----------------------------------
I had produced this case:
In order to simulate some dead server is being prcoessed:
1.create some table
2.restart hmaster, after geting region server , wait 60s(I added some code in
hmaster)
int regionCount = this.serverManager.waitForRegionServers();
LOG.info("++++sleep 60++++ ");
Thread.sleep(60000);
3.kill the meta region server
4.Master gets the envents of Meta region server is down.
5.assign the meta table.
6. SSH start to split the Hlog(some meta will lose)
> 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, 5179-90v2.patch, 5179-90v3.patch,
> 5179-90v4.patch, 5179-v2.txt, 5179-v3.txt, 5179-v4.txt, hbase-5179.patch,
> hbase-5179v5.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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