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https://issues.apache.org/jira/browse/HBASE-7846?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13578614#comment-13578614
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Jean-Marc Spaggiari commented on HBASE-7846:
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I have done exactly that in something I called "MassMerger" ;)
I can attach it here if you want.
There is also one option to "loop" until there is one region remaining...
> Add support for merging implicit regions in Merge tool
> ------------------------------------------------------
>
> Key: HBASE-7846
> URL: https://issues.apache.org/jira/browse/HBASE-7846
> Project: HBase
> Issue Type: Improvement
> Components: util
> Reporter: Kaufman Ng
> Priority: Minor
>
> Currently org.apache.hadoop.hbase.util.Merge needs 2 region names to be
> explicitly specified to perform a merge. This can be cumbersome.
> One idea for improvement is to have Merge to figure out all the adjacent
> regions and perform the merges.
> For example:
> regions before merge: row-10, row-20, row-30, row-40, row-50
> regions after merge: row-10, row-30, row-50
> In the above example, region names of "row-10" and "row-20" are merged to
> become a new bigger region of "row-10".
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