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https://issues.apache.org/jira/browse/HBASE-15156?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15274228#comment-15274228
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Stephen Yuan Jiang commented on HBASE-15156:
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[~toffer], look at your patch. Overall, it looks good. If you can add a UT
that assign daughter regions to different RS, this would be even better. I
have a question on the new config you added, it looks like only be checked in
unit test.
When [~mbertozzi] and I discussed on AM rewrite, we talked about the same idea
to assign one daughter region to a non-parent RS. I think the logic you put
here would also be benefit in master branch for the new AM.
> Support first assignment of split daughters to non-parent RS
> ------------------------------------------------------------
>
> Key: HBASE-15156
> URL: https://issues.apache.org/jira/browse/HBASE-15156
> Project: HBase
> Issue Type: Sub-task
> Reporter: Francis Liu
> Assignee: Francis Liu
> Attachments: HBASE-15156.patch, HBASE-15156_1.patch
>
>
> On region split, the region's daughter is always opened by the same region
> server hosting the parent region. In some cases this is not ideal:
> This feature was mainly needed for favored nodes to allow for more freedom
> when selecting favored nodes for daughter regions. ie The daughter doesn't
> have to always select the regionserver hosting the split as a favored node
> which should allow for better favored node distribution.
> Though this feature is actually useful in cases where region splits occur
> much more often than the balancer is run. It also is a bit more efficient as
> the major compaction that occurs after daughter assignment does not go to
> waste (ie cancelled half-way, loss of locality due to move, etc). We actually
> run it this way in some of our clusters even without favored nodes enabled.
> Hence I am supplying a patch which is independent of favored nodes.
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