[HBASE-25211] Rack awareness in region_mover

• Type: Improvement
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 3.0.0-alpha-1, 2.5.0, 2.4.1
• Hadoop Flags: Reviewed
• Assignee: Viraj Jasani
• Reporter: Viraj Jasani
• Created: 21/Oct/20 15:17
• Updated: 12/Mar/21 08:40
• Resolved: 12/Jan/21 23:57

Description

region_mover should provide an option to ensure while unloading all regions, all destination servers are selected from different racks and not the one where server (where region_mover unload is getting executed) belongs to. This might be helpful option if we want to avail rack downtime (or rack upgrade) by stopping all Regionservers that belong to same rack for few hours. Without this option, we don't have any control over which destination server is selected and hence, some regions might keep bouncing from server A to B in the same rack all the way until they are finally moved to RS that belongs to separate rack.

Issue Links

• causes: HBASE-25554 NPE when init RegionMover
• links to: GitHub Pull Request #2795