Membership Changes#

// TODO

Rough Notes#

• Dynamically add/remove nodes from cluster
• Replicate configuration changes through Raft log
• Joint consensus (C_old,new) to prevent split brain during transitions
• Or single-server changes (simpler, safer)
• AddServer and RemoveServer operations
• Catch up new servers before adding to cluster
• Handle leader stepping down if removed from cluster

Cluster Management API#

1. POST /cluster/join

Join a cluster.

POST /cluster/join
Body:
  {
    "leader": ":<port>"    # the leader's address
  }
Response:
  - 200 OK: Successfully joined cluster

2. POST /cluster/leave

Leave the cluster.

POST /cluster/leave
Response:
  - 200 OK: Successfully initiated removal from cluster

Resources#

• The Raft Consensus Algorithm
• Students’ Guide to Raft by Jon Gjengset