Producers Acks Deep Dive acks = all (replicas acks)

1. Leader + Replicas ack requested

2. Added latency and safety

3. No data loss if enough replicas

- Necessary setting if you don't want to lose data

- Acks=all must be used in conjunction with min.insync.replicas.

- min.insync.replicas can be set at the broker or topic level (override).

- min.insync.replicas=2 implies that at least 2 brokers that are ISR(including leader) must responsd that they have the data.

- That means if you use replication.factor=3, min.insync=2, acks=all, you can only tolerate I broker going down, otherwise the producer will receive an exception on send.