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https://issues.apache.org/jira/browse/HBASE-3144?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Andrew Purtell resolved HBASE-3144.
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Resolution: Not a Problem
> Freeze and thaw for regions and/or regionservers
> ------------------------------------------------
>
> Key: HBASE-3144
> URL: https://issues.apache.org/jira/browse/HBASE-3144
> Project: HBase
> Issue Type: New Feature
> Components: regionserver
> Reporter: Karthik Ranganathan
>
> When frozen, a region would not flush new files or delete old files.
> Context:
> Was talking to Dhruba about the possibility of a fast intra-cluster copy, and
> he says it is totally do-able. The idea is this: if there is a HBase table
> that is very large (multiple terabytes) then distcp takes a long time. The
> major bottleneck is the cross rack network transfer time. We can easily avoid
> this by going to each of the block replicas and replicating them on the same
> machine from one disk to another. For our infrastructure setup, this could
> make hours of copy time seconds.
> If we are able to implement the above, then copying an entire HBase table
> will only take seconds. Now we just have to ensure that the region files do
> not "change" during this period - so we need to disable compactions and
> flushes. Hence the need for the freeze and thaw of regions in a region server.
> The way this would work is to flush a region, freeze it, snapshot it, then
> thaw it and let normal operations proceed. The snapshot would proceed at disk
> read/write speed so it should take only seconds per region.
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