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From "Liu Shaohui (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HBASE-12451) IncreasingToUpperBoundRegionSplitPolicy may cause unnecessary region split in rolling update of cluster
Date Mon, 10 Nov 2014 12:26:34 GMT
Liu Shaohui created HBASE-12451:
-----------------------------------

             Summary: IncreasingToUpperBoundRegionSplitPolicy may cause unnecessary region
split in rolling update of cluster
                 Key: HBASE-12451
                 URL: https://issues.apache.org/jira/browse/HBASE-12451
             Project: HBase
          Issue Type: Bug
            Reporter: Liu Shaohui
            Assignee: Liu Shaohui
            Priority: Minor
             Fix For: 2.0.0


Currently IncreasingToUpperBoundRegionSplitPolicy is the default region split policy. In this
policy, split size is the number of regions that are on this server that all are of the same
table, cubed, times 2x the region flush size.

But when unloading regions of a regionserver in a cluster using region_mover.rb, the number
of regions that are on this server that all are of the same table will decrease, and the split
size will decrease too, which may cause the left region split in the regionsever. Region Splits
also happens when loading regions of a regionserver in a cluster. 

A improvment may set a minmum split size in IncreasingToUpperBoundRegionSplitPolicy
Suggestions are welcomed. Thanks~




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