Which are the services provided by ZooKeeper?

ZooKeeper is an open source Apache project that provides a centralized service for providing configuration information, naming, synchronization and group services over large clusters in distributed systems. The goal is to make these systems easier to manage with improved, more reliable propagation of changes.

How many servers does ZooKeeper have?

ZooKeeper runs in Java, release 1.6 or greater (JDK 6 or greater). It runs as an ensemble of ZooKeeper servers. Three ZooKeeper servers is the minimum recommended size for an ensemble, and we also recommend that they run on separate machines.

Is ZooKeeper a Service Discovery?

Nevertheless, ZooKeeper is one of the most popular service discovery mechanisms used in the microservices world. Lets get started!

What is ZooKeeper in system design?

ZooKeeper is a distributed, open-source coordination service for distributed applications. It exposes a simple set of primitives that distributed applications can build upon to implement higher level services for synchronization, configuration maintenance, and groups and naming.

Which service is not provided by ZooKeeper?

Explanation: Identity Service is not a service provided by ZooKeeper.

What is ZooKeeper explain services ZooKeeper guarantees?

What if ZooKeeper goes down?

If one the ZooKeeper nodes fails, the following occurs: Other ZooKeeper nodes detect the failure to respond. A new ZooKeeper leader is elected if the failed node is the current leader. If multiple nodes fail and ZooKeeper loses its quorum, it will drop into read-only mode and reject requests for changes.

What is the benefit of Eureka and ZooKeeper?

Because Eureka is built explicitly for service discovery, it provides a client library that provides functionality such as service heartbeats, service health checks, automatic publishing, and refreshing caches. With ZooKeeper, you would have to implement all of these things yourself.

What is ZooKeeper application?

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.

What is ZooKeeper Kafka?

ZooKeeper is used in distributed systems for service synchronization and as a naming registry. When working with Apache Kafka, ZooKeeper is primarily used to track the status of nodes in the Kafka cluster and maintain a list of Kafka topics and messages.

Is ZooKeeper a load balancer?

ZooKeeper is used for High Availability, but not as a Load Balancer exactly. High Availability means, you don’t want to loose your single point of contact i.e. your master node. If one master goes down there should be some else who can take care and maintain the same state.