AFAIK there won't be two leaders. Once brokers lose connection with ZooKeeper, a new leader will be elected (whichever can still access ZooKeeper) and the remaining brokers will fall behind in replication.
Now depending on your config, there might be several other issues: not enough replicas to satisfy ISR requirement, so no new writes; if the broker that becomes a new leader was already behind in replication and unclean leader election is enabled, you might have some data loss, etc. On Mon, Sep 23, 2019 at 2:52 PM Isuru Boyagane < isuruboyagane...@cse.mrt.ac.lk> wrote: > Can anyone clarify how Kafka manages below network partition? > > Say we have this configuration before the network partition, > > - Kafka cluster has three brokers (say broker_0, broker_1, broker2). > - broker_1 is the leader. > - ISR has been reduced to broker_1 and broker_2. > - There is a Zookeeper cluster. > > Now if a network partition happens such that, > > 1. broker_1(leader), broker_2 in a separate partition > 2. broker_0 and Zookeeper in another partition > > (An image clarifying the network partition scenario is attached herewith.) > > Will there be two leaders? > If so, How they continue when the partition is resolved? > > Thanks and Regards. > >
