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From "Ted Yu (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-7506) Judgment of carrying ROOT/META will become wrong when expiring server
Date Tue, 08 Jan 2013 05:30:17 GMT

    [ https://issues.apache.org/jira/browse/HBASE-7506?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13546621#comment-13546621
] 

Ted Yu commented on HBASE-7506:
-------------------------------

I think we should keep MetaServerShutdownHandler.
Take a look at HBASE-3809
                
> Judgment of carrying 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
>
>         Attachments: 7506-trunk v1.patch
>
>
> 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 wrong.
> See AssignmentManager#isCarryingRegion for details
> With the wrong judgement of carrtying ROOT/META, we would assign ROOT/META twice.

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