chunhui shen created HBASE-6228:
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Summary: Fixup daughters twice cause daughter region assigned
twice
Key: HBASE-6228
URL: https://issues.apache.org/jira/browse/HBASE-6228
Project: HBase
Issue Type: Bug
Components: master
Reporter: chunhui shen
Assignee: chunhui shen
First, how fixup daughters twice happen?
1.we will fixupDaughters at the last of HMaster#finishInitialization
2.ServerShutdownHandler will fixupDaughters when reassigning region through
ServerShutdownHandler#processDeadRegion
When fixupDaughters, we will added daughters to .META., but it coudn't prevent
the above case, because FindDaughterVisitor.
The detail is as the following:
Suppose region A is a splitted parent region, and its daughter region B is
missing
1.First, ServerShutdownHander thread fixup daughter, so add daughter region B
to .META. with serverName=null, and assign the daughter.
2.Then, Master's initialization thread will also find the daughter region B is
missing and assign it. It is because FindDaughterVisitor consider daughter is
missing if its serverName=null
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