Notes on Distributed Systems

Consensus
Paxos
Roles: proposers, acceptors, learners

Practices:
Cassandra lightweight transactions, CAS

Raft
replicated state machine
strong leadership
(append-only) log replication
a term number and an index
randomized election timeout

2 Phase Commit
Vote
Commit/abort
a blocking protocol

3 Phase Commit
Vote
Prepare
Commit/abort
a non-blocking protocol

CAP
LSM

Redis
pub-sub
Only online customers can get message
No customer group, each customer gets all message

Basic
WAL - write-ahead-log
R+W>N

Scalable Stateful Services

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