[CASSANDRA-1559] make {SuperColumn,ColumnFamily}.addColumn() correct in the face of concurrent removals

• Type: Improvement
• Status: Resolved
• Priority: Low
• Resolution: Fixed
• Fix Version/s: 0.7.4
• Assignee: Peter Schuller
• Reporter: Peter Schuller

Authors

Peter Schuller

Reviewers

Sylvain Lebresne

• Created: 29/Sep/10 22:46
• Updated: 16/Apr/19 09:33
• Resolved: 04/Mar/11 14:56

Description

As reported on the mailing list, the particular lock-less spinning used during column addition is not correct for the case of concurrent removals. As also agreed, concurrent removals do not actually happen.

Attaching a patch which, as jbellis suggests as an alternative to documenting the restriction on removals not being supported concurrently, makes addColumn() handle that case.