Liu Shaohui created HBASE-12451:
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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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