Thiruvel Thirumoolan created HBASE-17620:

             Summary: Move table to another group (add -migrateTertiary)
                 Key: HBASE-17620
             Project: HBase
          Issue Type: Sub-task
          Components: FavoredNodes
            Reporter: Thiruvel Thirumoolan
            Assignee: Thiruvel Thirumoolan

As part of the design document in HBASE-15531, we mentioned about an approach 
to move tables to new group. First only one favored node would be moved to the 
new group using something like "rpm -migrateTertiary" command (this will be 
something else since RPM will be deprecated). Once enough locality has builtup 
on the tertiary nodes, the table can be moved to the group.

In my experience, the likelihood of tables moving across groups is rare and 
there is a brief amount of time when one of the FN will belong to another group 
and stuff like that. When regions split, we also have to consider this 
situation and generate one FN from the target (or tertiary's) group.

Is this feature required? Do we need this as a start? I can attach tentative 
patches and we could reconsider this in future if we don't need this as a start.

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