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https://issues.apache.org/jira/browse/HBASE-10576?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13980695#comment-13980695
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stack commented on HBASE-10576:
-------------------------------

bq. If current implementation can handle those similar corner cases from 
indeterministic nature of AM, I think current load balancer approach is also 
good.

[~jeffreyz] I was going to say no but seems like @rajeshbabu can do it w/ his 
patch according to list above (Thanks for making the list).  I see merit in 
your proposal now where shadow region is opened by a coprocessor (but otherwise 
is in the 'shadows' as far as the cluster is concerned -- no entry in 
hbase:meta).

[~rajesh23] Please tell me more how this balancer works.  It is not clear 
skimming the code.  'colocate' is how you term data and index tables going 
together?

We cannot hack up the core of hbase to get this feature in.

Thanks.

> 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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