APACHE ZooKeeper is a service used by a cluster (group of nodes) to coordinate between themselves and maintain shared data with robust synchronization techniques. ZooKeeper is itself a distributed application providing services for writing a distributed application.

The common services provided by ZooKeeper are as follows :

Naming service:Identifying the nodes in a cluster by name. It is similar to DNS, but for nodes.

Configuration management: Latest and up-to-date configuration information of the system for a joining node.

Cluster management:Joining / leaving of a node in a cluster and node status at real TIME.

LEADER election:Electing a node as leader for coordination PURPOSE.

Locking and synchronization service:Locking the data while modifying it. This mechanism helps you in automatic fail recovery while connecting other distributed applications like Apache HBase.

Highly RELIABLE data registry:Availability of data even when one or a few nodes are down.

Apache ZooKeeper is a service used by a cluster (group of nodes) to coordinate between themselves and maintain shared data with robust synchronization techniques. ZooKeeper is itself a distributed application providing services for writing a distributed application.

The common services provided by ZooKeeper are as follows :

Naming service:Identifying the nodes in a cluster by name. It is similar to DNS, but for nodes.

Configuration management: Latest and up-to-date configuration information of the system for a joining node.

Cluster management:Joining / leaving of a node in a cluster and node status at real time.

Leader election:Electing a node as leader for coordination purpose.

Locking and synchronization service:Locking the data while modifying it. This mechanism helps you in automatic fail recovery while connecting other distributed applications like Apache HBase.

Highly reliable data registry:Availability of data even when one or a few nodes are down.