[HBASE-28376] Column family ns does not exist in region during upgrade to 3.0.0-beta-2

• Type: Bug
• Status: Resolved
• Priority: Blocker
• Resolution: Fixed
• Affects Version/s: 3.0.0-beta-1
• Fix Version/s: 3.0.0-beta-2
• Component/s: meta
• Labels: pull-request-available
• Hadoop Flags: Reviewed
• Assignee: Duo Zhang
• Reporter: Bryan Beaudreault
• Created: 17/Feb/24 22:30
• Updated: 10/Mar/24 20:26
• Resolved: 10/Mar/24 08:46

Description

Upgrading from 2.5.x to 3.0.0-alpha-2, migrateNamespaceTable kicks in to copy data from the namespace table to an "ns" family of the meta table. If you don't have an "ns" family, the migration fails and the hmaster will crash loop. You then can't rollback, because the briefly alive upgraded hmaster created a procedure that can't be deserialized by 2.x (I don't have this log handy unfortunately). I tried pushing code to create the ns family on startup, but it doesnt work becuase the migration happens while the hmaster is still initializing.

So it seems imperative that you create the ns family before upgrading. We should handle this more gracefully.

Issue Links

• is related to: HBASE-21154 Remove hbase:namespace table; fold it into hbase:meta
• is related to: HBASE-23055 Alter hbase:meta
• links to: GitHub Pull Request #5697