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From "Thiruvel Thirumoolan (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HBASE-17620) Move table to another group (add -migrateTertiary)
Date Thu, 09 Feb 2017 20:46:41 GMT
Thiruvel Thirumoolan created HBASE-17620:
--------------------------------------------

             Summary: Move table to another group (add -migrateTertiary)
                 Key: HBASE-17620
                 URL: https://issues.apache.org/jira/browse/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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