[HBASE-16119] Procedure v2 - Reimplement merge

• Type: Sub-task
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 2.0.0
• Fix Version/s: 2.0.0
• Component/s: proc-v2, Region Assignment
• Hadoop Flags: Incompatible change, Reviewed

Release Note

The merge region logic is controlled by master in 2.0.0 (in 1.x, the core merge region logic is in the region server side). The coprocessors related to merge region in RS-side would be no-op in 2.0.0 and later release. Therefore, this is an incompatible change. Users needs to move the CP logic to new master CP and registers them.

A new mergeRegionsAsync() API is added in client. The existing mergeRegions() API will call the new API so client does not have to change its code.

• Assignee: Stephen Yuan Jiang
• Reporter: Matteo Bertozzi
• Created: 27/Jun/16 05:54
• Updated: 17/Jun/22 18:05
• Resolved: 02/Dec/16 07:37

Description

use the proc-v2 state machine for merge. also update the logic to have a single meta-writer.

Issue Links

• breaks: HBASE-17246 TestSerialReplication#testRegionMerge fails in master branch
• is depended upon by: HBASE-17470 Remove merge region code from region server
• is required by: HBASE-17066 Procedure v2 - Add handling of merge region transition to the new AM