Concurrent processing of processFaileOver and ServerShutdownHandler may cause
region is assigned before completing split log, it would cause data loss
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Key: HBASE-5179
URL: https://issues.apache.org/jira/browse/HBASE-5179
Project: HBase
Issue Type: Bug
Components: master
Reporter: chunhui shen
Assignee: chunhui shen
If master's processing its failover and ServerShutdownHandler's processing
happen concurrently, it may appear following case.
1.master completing 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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