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