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From "zhangduo (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-12451) IncreasingToUpperBoundRegionSplitPolicy may cause unnecessary region splits in rolling update of cluster
Date Fri, 22 May 2015 00:42:17 GMT

    [ https://issues.apache.org/jira/browse/HBASE-12451?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14555374#comment-14555374
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zhangduo commented on HBASE-12451:
----------------------------------

Maybe we could make a new split policy?
Make getCountOfCommonTableRegions as an abstract protected method, the old IncreasingToUpperBoundRegionSplitPolicy
just use the old implementation which only counts region locally and our new policy will fetch
information from master?

> IncreasingToUpperBoundRegionSplitPolicy may cause unnecessary region splits 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
>
>         Attachments: HBASE-12451-v1.diff, HBASE-12451-v2.diff
>
>
> 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 minimum split size in IncreasingToUpperBoundRegionSplitPolicy
> Suggestions are welcomed. Thanks~



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