- Messages are appended to a topic-partition in the order they are sent
- Consumers read messages in the order stored in a topic-partition
- With a replication factor of N, producers and consumers can tolerate up to N-I brokers being down
- This is why a replication factor of 3 is a good idea:
- Allows for on broker to be taken down for maintenance
- Allows for another broker to be taken down unexpectedly
- As long as the number of partitions remains constant for a topic(no new partitions), the same key will always go to the same partition
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