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From "Ted Yu (JIRA)" <j...@apache.org>
Subject [jira] [Resolved] (HBASE-6317) Master clean start up and Partially enabled tables make region assignment inconsistent.
Date Mon, 10 Dec 2012 20:35:22 GMT

     [ https://issues.apache.org/jira/browse/HBASE-6317?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Ted Yu resolved HBASE-6317.
---------------------------

    Resolution: Fixed

Integrated to 0.92 as well.

Thanks Rajesh for the backport.
                
> Master clean start up and Partially enabled tables make region assignment inconsistent.
> ---------------------------------------------------------------------------------------
>
>                 Key: HBASE-6317
>                 URL: https://issues.apache.org/jira/browse/HBASE-6317
>             Project: HBase
>          Issue Type: Bug
>            Reporter: ramkrishna.s.vasudevan
>            Assignee: rajeshbabu
>             Fix For: 0.92.3, 0.96.0, 0.94.4
>
>         Attachments: HBASE-6317_92.patch, HBASE-6317_94_3.patch, HBASE-6317_94_4.patch,
HBASE-6317_94.patch, HBASE-6317_trunk_2.patch, HBASE-6317_trunk_3.patch, HBASE-6317_trunk_4.patch,
HBASE-6317_trunk_5.patch
>
>
> If we have a  table in partially enabled state (ENABLING) then on HMaster restart we
treat it as a clean cluster start up and do a bulk assign.  Currently in 0.94 bulk assign
will not handle ALREADY_OPENED scenarios and it leads to region assignment problems.  Analysing
more on this we found that we have better way to handle these scenarios.
> {code}
> if (false == checkIfRegionBelongsToDisabled(regionInfo)
>             && false == checkIfRegionsBelongsToEnabling(regionInfo)) {
>           synchronized (this.regions) {
>             regions.put(regionInfo, regionLocation);
>             addToServers(regionLocation, regionInfo);
>           }
> {code}
> We dont add to regions map so that enable table handler can handle it.  But as nothing
is added to regions map we think it as a clean cluster start up.
> Will come up with a patch tomorrow.

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