Kafka réplique les partitions sur plusieurs brokers pour la durabilité et la disponibilité — chaque partition a un leader et des replicas followers. Si un broker échoue, un follower prend le relais. Comprendre la réplication est essentiel à la tolérance aux pannes de Kafka.
Comment fonctionne la réplication
Each PARTITION is replicated across multiple brokers (REPLICATION FACTOR copies, e.g. 3):
→ LEADER replica → handles all reads and writes for the partition
→ FOLLOWER replicas → copy (replicate) the leader's data, staying in sync
→ producers/consumers interact with the LEADER; followers are backups
→ if the leader's broker FAILS → a follower is promoted to leader (failover) → no data loss,
continued availability
