[CASSANDRA-8640] Paxos requires all nodes for CAS

• Type: Bug
• Status: Resolved
• Priority: Normal
• Resolution: Fixed
• Fix Version/s: 2.0.12, 2.1.3
• Labels: LWT qa-resolved
• Severity: Normal
• Assignee: Anthony Cozzie
• Reporter: Anthony Cozzie

Authors

Anthony Cozzie

Reviewers

Aleksey Yeschenko

• Tester: Philip Thompson
• Created: 17/Jan/15 00:28
• Updated: 16/Apr/19 09:31
• Resolved: 17/Jan/15 01:17

Description

In C* 2.1,

int requiredParticipants = participants + 1  / 2; // See CASSANDRA-833

Will always return participants because of operator precedence. I am not sure just adding parentheses will fix the problem, though, as the original code differentiated between pending and natural endpoints.

 int requiredParticipants = pendingEndpoints.size() + 1 + naturalEndpoints.size() / 2; // See CASSANDRA-833

Issue Links

• is broken by: CASSANDRA-8346 Paxos operation can use stale data during multiple range movements