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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 Fri, 22 Jun 2012 11:46:43 GMT

    [ https://issues.apache.org/jira/browse/HBASE-6227?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13399273#comment-13399273
] 

ramkrishna.s.vasudevan commented on HBASE-6227:
-----------------------------------------------

+1  on patch.  This along with HBASE-5916 helps in solving many issues that happens during
master restart and SSH going parallely.

                
> 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, HBASE-6227v2.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.
> Let me describe it in more detail.
> Suppose there are two regionservers A1 and B1, A1 carried META and ROOT
> 1.master restart and completed assignRootAndMeta
> 2.A1 and B1 are both restarted, new regionservers are A2 and B2
> 3.SSH which processed for A1 completed assigning ROOT and META
> 4.master do rebuilding user regions and no regions added to master's region list
> 5.master consider it as a cluster startup, and assign all user regions
> 6.SSH which processed for B1 start to split B1's logs
> 7.All regions' data carried by B1 would loss.

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