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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