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From "Jonathan Hsieh (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-7735) Prevent regions from moving during online snapshot.
Date Tue, 19 Mar 2013 13:55:15 GMT

    [ https://issues.apache.org/jira/browse/HBASE-7735?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13606352#comment-13606352
] 

Jonathan Hsieh commented on HBASE-7735:
---------------------------------------

[~terry_zhang], there shouldn't be data loss -- there is a verification step after the snapshot
attempt and if regions move (or a rs goes down) the verification will fail and cause the snapshot
to explicitly fail and tell the user.  No data loss.
                
> 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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