[HBASE-21560] Return a new TableDescriptor for MasterObserver#preModifyTable to allow coprocessor modify the TableDescriptor

• Type: Improvement
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 3.0.0-alpha-1, 2.2.0
• Component/s: Coprocessors
• Hadoop Flags: Incompatible change
• Release Note: Incompatible change. Allow MasterObserver#preModifyTable to return a new TableDescriptor. And master will use this returned TableDescriptor to modify table.
• Assignee: Guanghao Zhang
• Reporter: Guanghao Zhang
• Created: 06/Dec/18 10:25
• Updated: 04/Jan/19 20:54
• Resolved: 08/Dec/18 08:05

Description

Same with HBASE-21550. The new TableDescriptor is immutable for 2.0+. But in our use case, the coprocessor may change the TableDescriptor when preModifyTable. It is allowed before 2.0. For 2.0+, We can return a new TableDescriptor for MasterObserver#preModifyTable to allow this.

Issue Links

• relates to: HBASE-21676 Port HBASE-21560 (Return a new TableDescriptor for MasterObserver#preModifyTable to allow coprocessor modify the TableDescriptor) to branch-1
• links to: Review Board (master)