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https://issues.apache.org/jira/browse/HBASE-10576?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13980481#comment-13980481
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stack commented on HBASE-10576:
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Do we have to go the route of special-casing 'shadow-regions'. The LB is
responsible for assignments. Assignment policy belongs in the LB. The LB is
meant to allow new factors balancing.
Special-casing assignments per new feature will fast become unmaintainable IMO.
Related story: Jimmy Xiang just made it so Master and Backup Masters are also
RegionServers. In the code, spread all about -- in the LB but also on region
open, etc. -- there was special-casing such that if a backup master, then only
carry a few regions (configurable). Jimmy just did the work to move this work
all up into the LB. Now it is in one place only.
> Custom load balancer to co-locate the regions of two tables which are having
> same split keys
> --------------------------------------------------------------------------------------------
>
> Key: HBASE-10576
> URL: https://issues.apache.org/jira/browse/HBASE-10576
> Project: HBase
> Issue Type: Sub-task
> Components: Balancer
> Reporter: rajeshbabu
> Assignee: rajeshbabu
> Attachments: HBASE-10536_v2.patch, HBASE-10576.patch
>
>
> To support local indexing both user table and index table should have same
> split keys. This issue to provide custom balancer to colocate the regions of
> two tables which are having same split keys.
> This helps in Phoenix as well.
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