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Two DCs, 3 nodes each. Click 'Toggle partition' to break the link between them.
What you're seeing
CAP: under a network partition, you must choose between consistency and availability.
AP (Cassandra): both sides keep accepting writes. They diverge during the partition; reconcile (last-write-wins, vector clocks) when partition heals. Available; not consistent.
CP (etcd, ZooKeeper): only the side with majority accepts writes. The minority side returns errors. Consistent; not fully available.
★ KEY TAKEAWAY
Under network partition you must choose: AP (keep accepting writes, diverge) or CP (block writes on the minority side, stay consistent).
▶ WHAT TO TRY
- Click Toggle partition to split the cluster.
- Switch between AP and CP modes — see how writes behave differently.
- Cassandra is AP; etcd/ZooKeeper are CP.