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HBase >> mail # user >> Merge large number of regions

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Merge large number of regions
We moved to 0.92.2 some time ago and with that, increased the max file size
setting to 4GB (from 2GB). Also an application triggered cleanup operation
deleted lots of unwanted rows.
These two combined have gotten us to a state where lots of regions are
smaller than desired size.

Merging regions two at a time seems time consuming and will be hard to
automate. https://issues.apache.org/jira/browse/HBASE-1621 automates
merging, but it is not stable.

I am interested in knowing about other possible approaches folks have
tried. What do you guys think about copyTable based approach ? (old
---copyTable---> new and then rename new to old)