[HBASE-17620] Move table to another group (add -migrateTertiary)

• Type: Sub-task
• Status: Closed
• Priority: Major
• Resolution: Incomplete
• Component/s: FavoredNodes
• Assignee: Unassigned
• Reporter: Thiruvel Thirumoolan
• Created: 09/Feb/17 20:45
• Updated: 23/Jun/22 19:14
• Resolved: 23/Jun/22 19:14

Description

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.