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“To survive hardware destruction, each partition has 1 Leader replica and N Follower replicas. The broker tracks In-Sync Replicas (ISR). With acks=all and min.insync.replicas=2, an acknowledgment is returned only after the message is safely replicated across quorum nodes.”
Raft/Paxos-style replication quorum, min.insync.replicas, and leader failovers.
// High-Durability Producer Configuration
const producer = kafka.producer({
acks: -1, // acks=all: wait for full In-Sync Replica quorum
timeout: 30000,
retry: {
initialRetryTime: 100,
retries: 8
}
});Setting replication factor = 3 and min.insync.replicas = 2 allows continuous writes and zero data loss even during full single-node hardware outages.