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https://issues.apache.org/jira/browse/HBASE-12975?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14384320#comment-14384320
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Andrew Purtell commented on HBASE-12975:
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{quote}
And also as stack mentioned here
https://issues.apache.org/jira/browse/HBASE-12975?focusedCommentId=14367729&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-14367729

Instead of using SplitTransactionImpl directly It's better to use split 
transaction implementation created from factory based on configuration.
{quote}

The latest patch does this, except for in some unit tests. But I will double 
check that some hunk wasn't missed.

> Supportable SplitTransaction and RegionMergeTransaction interfaces
> ------------------------------------------------------------------
>
>                 Key: HBASE-12975
>                 URL: https://issues.apache.org/jira/browse/HBASE-12975
>             Project: HBase
>          Issue Type: Improvement
>            Reporter: Rajeshbabu Chintaguntla
>            Assignee: Andrew Purtell
>             Fix For: 2.0.0, 1.1.0
>
>         Attachments: HBASE-12975.patch, HBASE-12975.patch, HBASE-12975.patch
>
>
> Making SplitTransaction, RegionMergeTransaction limited private is required 
> to support local indexing feature in Phoenix to ensure regions colocation. 
> We can ensure region split, regions merge in the coprocessors in few method 
> calls without touching internals like creating zk's, file layout changes or 
> assignments.
> 1) stepsBeforePONR, stepsAfterPONR we can ensure split.
> 2) meta entries can pass through coprocessors to atomically update with the 
> normal split/merge.
> 3) rollback on failure.



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