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From "terry zhang (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-7735) Prevent regions from moving during online snapshot.
Date Tue, 19 Mar 2013 07:55:15 GMT

    [ https://issues.apache.org/jira/browse/HBASE-7735?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13606149#comment-13606149
] 

terry zhang commented on HBASE-7735:
------------------------------------

hi @Jonathan Hsieh  I mean region is moving between region server before regionserver getonlineregion
. This means the moving region doesn't belong to anyone of regionserver. Would this case lead
data lose in snapshot and user don't know about it?
                
> Prevent regions from moving during online snapshot.
> ---------------------------------------------------
>
>                 Key: HBASE-7735
>                 URL: https://issues.apache.org/jira/browse/HBASE-7735
>             Project: HBase
>          Issue Type: Sub-task
>            Reporter: Jonathan Hsieh
>
> To increase the probability of snapshots succeeding, we should attempt to prevent splits
and region moves from happening.  Currently we take region locks but this could be "too late"
and results in an aborted snapshot.  
> We should probably take the table lock (0.96) when starting a snapshot and for  a 0.94
backport we should probably disable the balancer.
> This will probably not be tackled until after trunk merge.

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