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From "ramkrishna.s.vasudevan (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-6227) SSH and cluster startup causes data loss
Date Mon, 18 Jun 2012 07:30:42 GMT

    [ https://issues.apache.org/jira/browse/HBASE-6227?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13395452#comment-13395452
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ramkrishna.s.vasudevan commented on HBASE-6227:
-----------------------------------------------

@Chunhui
In both SSH and rebuildUserRegions we try to Scan META. 
So if there is no META are we not waiting till it is available (Correct me if am wrong here)?

So that any way the SSH for META or SSH for ROOT will do splitlog right?
Also on seeing the scenario that you are saying and with my queries(doubts) above i felt there
could be double assignment may be.  I will once again go thro this place and see what happens..

                
> SSH and cluster startup  causes data loss
> -----------------------------------------
>
>                 Key: HBASE-6227
>                 URL: https://issues.apache.org/jira/browse/HBASE-6227
>             Project: HBase
>          Issue Type: Bug
>          Components: master
>            Reporter: chunhui shen
>            Assignee: chunhui shen
>         Attachments: HBASE-6227.patch
>
>
> In AssignmentManager#processDeadServersAndRegionsInTransition, if servershutdownhandler
is processing and master consider it cluster startup, master will assign all user regions,
however, servershutdownhandler has not completed splitting logs.
> Detail process as the following( 1 master, 1 regionserver):
> 1.All the servers are killed
> 2.master start up, regionserver's zk node exists, so master will record it
> 3.master won't split any logs
> 4.regionserver start up, and master assign root and meta
> 5.the old regionserver is in SSH now, when rebuild user region, no region is added in
master's region list
> 6.master consider it is cluster up, so it will assign all user regions
> 7.However, some region's data is in logs which are splittting by SSH

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