The ZooKeeper service is enabled in E-MapReduce clusters by default.
Create a cluster
After you have created a cluster and its status is idle, in the Clusters and Services page, select ZooKeeper, and then click Component Topology to view ZooKeeper nodes. E-MapReduce enables 3 ZooKeeper nodes. The corresponding intranet IP address (2181 is the default port) of ZooKeeper nodes are indicated in the IP column for access to the ZooKeeper service.