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From "stack (JIRA)" <j...@apache.org>
Subject [jira] Created: (HBASE-1506) Make splits faster by having the regionserver, on split, immediately start serving bottom half of the split
Date Tue, 09 Jun 2009 16:17:07 GMT
Make splits faster by having the regionserver, on split, immediately start serving bottom half
of the split
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                 Key: HBASE-1506
                 URL: https://issues.apache.org/jira/browse/HBASE-1506
             Project: Hadoop HBase
          Issue Type: Improvement
            Reporter: stack


Regionservers run splits.  They close the region to split, divide it, and then tell master
about the two new regions.  Master then assigns new regions.  New regions need to come up
in new locations.  Both regions are offline during this time.

Instead, regionserver might run split as it does now but new, deploy the lower-half on the
current regionserver immediately.  It'd then inform master that it had split, and that it
was serving the lower half.  Master would then take care of assigning the upper half.

Benefits would be that clients who were accessing the lower half of the split would not need
to go through recalibration.  They'd just keep working.  There'd be disruption for those keys
that landed in the top half of the split only.

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