[HBASE-25528] Dedicated merge dispatch threadpool on master

• Type: Improvement
• Status: Resolved
• Priority: Minor
• Resolution: Fixed
• Affects Version/s: 3.0.0-alpha-1, 1.7.0, 2.5.0
• Fix Version/s: 3.0.0-alpha-1, 1.7.0, 2.5.0, 2.3.5, 2.4.2
• Component/s: master
• Assignee: Bharath Vissapragada
• Reporter: Bharath Vissapragada
• Created: 25/Jan/21 20:59
• Updated: 03/Feb/21 12:34
• Resolved: 02/Feb/21 19:17

Description

Over the weekend we ran into an issue of running normalizer on a table with ~400k regions and we noticed the master was bottlenecked on merge dispatcher code that runs on a single threaded thread-pool that was meant for all master table operations (opcode: MASTER_TABLE_OPERATIONS). Having a dedicated thread-pool helped us dispatch merges at a faster rate.

Issue Links

• links to: GitHub Pull Request #2904
• links to: GitHub Pull Request #2909
• links to: GitHub Pull Request #2910