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https://issues.apache.org/jira/browse/HBASE-14614?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16053604#comment-16053604
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Phil Yang commented on HBASE-14614:
-----------------------------------

I see there is a comment:

{code:java|AssignmentManager.java}
  // TODO: AMv2
  //  - handle region migration from hbase1 to hbase2.
{code}
Does it mean we can not do a rolling upgrade from 1.x to 2.0 right now?

> Procedure v2: Core Assignment Manager
> -------------------------------------
>
>                 Key: HBASE-14614
>                 URL: https://issues.apache.org/jira/browse/HBASE-14614
>             Project: HBase
>          Issue Type: Sub-task
>          Components: proc-v2
>    Affects Versions: 2.0.0
>            Reporter: Stephen Yuan Jiang
>            Assignee: Matteo Bertozzi
>             Fix For: 2.0.0
>
>         Attachments: HBASE-14614.master.003.patch, 
> HBASE-14614.master.004.patch, HBASE-14614.master.005.patch, 
> HBASE-14614.master.006.patch, HBASE-14614.master.007.patch, 
> HBASE-14614.master.008.patch, HBASE-14614.master.009.patch, 
> HBASE-14614.master.010.patch, HBASE-14614.master.014.patch, 
> HBASE-14614.master.015.patch, HBASE-14614.master.017.patch, 
> HBASE-14614.master.018.patch, HBASE-14614.master.019.patch, 
> HBASE-14614.master.020.patch, HBASE-14614.master.022.patch, 
> HBASE-14614.master.023.patch, HBASE-14614.master.024.patch, 
> HBASE-14614.master.025.patch, HBASE-14614.master.026.patch, 
> HBASE-14614.master.027.patch, HBASE-14614.master.028.patch, 
> HBASE-14614.master.029.patch, HBASE-14614.master.030.patch, 
> HBASE-14614.master.033.patch, HBASE-14614.master.038.patch, 
> HBASE-14614.master.039.patch, HBASE-14614.master.040.patch, 
> HBASE-14614.master.041.patch, HBASE-14614.master.042.patch, 
> HBASE-14614.master.043.patch, HBASE-14614.master.044.patch, 
> HBASE-14614.master.045.patch, HBASE-14614.master.045.patch, 
> HBASE-14614.master.046.patch, HBASE-14614.master.047.patch, 
> HBASE-14614.master.048.patch, HBASE-14614.master.049.patch, 
> HBASE-14614.master.050.patch, HBASE-14614.master.051.patch
>
>
> New AssignmentManager implemented using proc-v2.
>  - AssignProcedure handle assignment operation
>  - UnassignProcedure handle unassign operation
>  - MoveRegionProcedure handle move/balance operation
> Concurrent Assign operations are batched together and sent to the balancer
> Concurrent Assign and Unassign operation ready to be sent to the RS are 
> batched together
> This patch is an intermediate state where we add the new AM as 
> AssignmentManager2() to the master, to be reached by tests. but the new AM 
> will not be integrated with the rest of the system. Only new am unit-tests 
> will exercise the new assigment manager. The integration with the master code 
> is part of HBASE-14616



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