Thiruvel Thirumoolan created HBASE-17620:
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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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