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From "chunhui shen (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HBASE-6228) Fixup daughters twice cause daughter region assigned twice
Date Mon, 18 Jun 2012 06:11:43 GMT
chunhui shen created HBASE-6228:
-----------------------------------

             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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