apache-kafka - 首选副本和领导者可以是不同的 Broker 吗？

Question

当我们运行一个主题描述时，我们可以在第四列中看到按首选副本顺序排列的副本列表，我总是看到列表中的第一个副本与领导者相同。我想知道首选副本和领导者是否可以是不同的Brokers？

Answer 1

他们可以不同

In an ideal scenario, the leader for a given partition should be the "preferred replica". This guarantees that the leadership load across the brokers in a cluster are evenly balanced. However, over time the leadership load could get imbalanced due to broker shutdowns (caused by controlled shutdown, crashes, machine failures etc).

https://cwiki.apache.org/confluence/display/KAFKA/Replication+tools#Replicationtools-1.PreferredReplicaLeaderElectionTool