[HBASE-21550] Add a new method preCreateTableRegionInfos for MasterObserver which allows CPs to modify the TableDescriptor

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 3.0.0-alpha-1, 2.2.0
• Component/s: Coprocessors
• Hadoop Flags: Reviewed

Release Note

Add a new method preCreateTableRegionInfos for MasterObserver, which will be called before creating region infos for the given table, before the preCreateTable method. It allows you to return a new TableDescritor to override the original one. Returns null or throws exception will stop the creation.

• Assignee: Duo Zhang
• Reporter: Duo Zhang
• Created: 05/Dec/18 09:55
• Updated: 07/Dec/18 12:00
• Resolved: 06/Dec/18 00:36

Description

Before 2.0, we will pass a HTableDescriptor and the CPs can modify the schema of a table, but now we will pass a TableDescriptor, which is immutable. I think it is correct to pass an immutable instance here, but we should have a return value for this method to allow CPs to return a new TableDescriptor.