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From "chunhui shen (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HBASE-7506) Judgement of carrtying ROOT/META will become wrong when expiring server
Date Mon, 07 Jan 2013 10:16:13 GMT
chunhui shen created HBASE-7506:

             Summary: Judgement of carrtying ROOT/META will become wrong when expiring server
                 Key: HBASE-7506
                 URL: https://issues.apache.org/jira/browse/HBASE-7506
             Project: HBase
          Issue Type: Bug
    Affects Versions: 0.94.3
            Reporter: chunhui shen
            Assignee: chunhui shen
             Fix For: 0.96.0

We will check whether server carrying ROOT/META when expiring the server.
See ServerManager#expireServer.

If the dead server carrying META, we assign meta directly in the process of ServerShutdownHandler.
If the dead server carrying ROOT, we will offline ROOT and then verifyAndAssignRootWithRetries()

How judgement of carrtying ROOT/META become wrong?
If region is in RIT, and isCarryingRegion() return true after addressing from zk.
However, once RIT time out(could be caused by this.allRegionServersOffline && !noRSAvailable,
see AssignmentManager#TimeoutMonitor)   and we assign it to otherwhere, this judgement become
See AssignmentManager#isCarryingRegion for details

With the wrong judgement of carrtying ROOT/META, we would assign ROOT/META twice.

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