Kafka replication

Kafka replication

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The current leader of a partition further maintains 3 sets: AR, ISR, CUR and RAR, which correspond to the set of replicas that are assigned to the partition, in-sync with the leader, catching up with the leader, and being reassigned to other brokers. Normally, ISR ⊆ AR and AR = ISR + CUR.

Replica

Replica { // a replica of a partition
broker_id : int
partition : Partition
isLocal : Boolean // is this replica local to this broker
log : Log // local log associated with this replica
hw : long // offset of the last committed message
leo : long // log end offset
}

Partition

Partition { //a partition in a topic
    topic : string
    partition_id : int
    leader: Replica // the leader replica of this partition
    commitQ: Queue // produce requests pending commit at the leader
    AR: Set[Replica] // replicas assigned to this partition
    ISR: Set[Replica] // In-sync replica set, maintained at the leader
    CUR: Set[Replica] // Catch-up replica set, maintained at the leader
    RAR: Set[Replica] // Reassigned replica set, maintained at the leader
}