[CASSANDRA-5062] Support CAS

• Type: New Feature
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 2.0 beta 1
• Component/s: API, Core
• Assignee: Jonathan Ellis
• Reporter: Jonathan Ellis
• Created: 13/Dec/12 15:24
• Updated: 28/May/13 23:35
• Resolved: 28/May/13 23:35

Description

"Strong" consistency is not enough to prevent race conditions. The classic example is user account creation: we want to ensure usernames are unique, so we only want to signal account creation success if nobody else has created the account yet. But naive read-then-write allows clients to race and both think they have a green light to create.

Sub-Tasks

• Add support for read at CL.SERIAL: Resolved
• Add support for specifying CAS commit CL: Resolved
• Add CAS CQL support: Resolved
• Add Paxos TTL setting: Resolved