The ZooKeeper service is currently enabled in E-MapReduce cluster by default.
ZooKeeper will have only 3 nodes no matter how many machines are currently in the cluster. More nodes are not supported currently.
Zookeeper will be ticked by default in the software configuration page where the E-MapReduce creates the cluster.
After the cluster is successfully created and the status is idle, view the cluster details page and you will find the node information of ZooKeeper. Corresponding intranet IP address (2181 for port by default) of ZooKeeper node is indicated on the process column for the access to ZooKeeper services.