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From "ramkrishna.s.vasudevan (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-7506) Judgment of carrying ROOT/META will become wrong when expiring server
Date Mon, 07 Jan 2013 17:14:13 GMT

    [ https://issues.apache.org/jira/browse/HBASE-7506?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13546048#comment-13546048
] 

ramkrishna.s.vasudevan commented on HBASE-7506:
-----------------------------------------------

You got this in trunk?  Am not able to visualise the problem due to not so good grip on the
Trunk code base wrt recent changes.
May be Jimmy can look this.
Will try to look into it once again later tomorrow.
[~jxiang]
Want to take a look at this?
                
> 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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