A ZooKeeper Quorum consisting of three ZooKeeper servers has been created.
zoo.cfg located on all three ZooKeeper servers looks as follows:
maxClientCnxns=50 # The number of milliseconds of each tick tickTime=2000 # The number of ticks that the initial # synchronization phase can take initLimit=10 # The number of ticks that can pass between # sending a request and getting an acknowledgement syncLimit=5 # the directory where the snapshot is stored. dataDir=/var/lib/zookeeper # the port at which the clients will connect clientPort=2181 server.1=<ip-address-1>:2888:3888 server.2=<ip-address-2>:2888:3888 server.3=<ip-address-3>:2888:3888
It is clear that one of the three ZooKeeper servers will become the
Leader and the others
Followers. If the
Leader ZooKeeper server has been shutdown the
Leader election will start again. The aim is to check if another ZooKeeper server will become the
Leader if the
Leader server has been shut down.
What command needs to be issued to check whether a ZooKeeper server is a Leader or a Follower?