Hi folks,
To achieve linearizable consistency in Cassandra, there are four round-trips must be performed: 1. Prepare/promise 2. Read/result 3. Propose/accept *4. **Commit/acknowledgment * In the last phase in Paxos protocol (white paper), there is decide phase only, no Commit/acknowledgment. DESIDE means to tell learners to apply the accepted value. If Commit/acknowledgment phase in CAS has similar purpose as DECIDE, then why we have an acknowledgment round? In fact, I want to know the purpose of Commit/acknowledgment phase in lineazaible consistency in Cassandra. I have read the http://www.datastax.com/dev/blog/lightweight-transactions-in-cassandra-2-0, but it does not explain whole the picture. I look forward to hearing from you Ibrahim
