Zookeeper provides a flexible coordination infrastructure for distributed environment. ZooKeeper framework supports many of the today’s best industrial applications. We will discuss some of the most notable applications of ZooKeeper in this chapter. Yahoo! The ZooKeeper framework was originally built at “Yahoo!”. A well-designed distributed application needs to meet requirements such as data transparency, better […]
Read MoreZookeeper – Overview ZooKeeper is a distributed co-ordination service to manage large set of hosts. Co-ordinating and managing a service in a distributed environment is a complicated process. ZooKeeper solves this issue with its simple architecture and API. ZooKeeper allows developers to focus on core application logic without worrying about the distributed nature of the […]
Read MoreBefore installing ZooKeeper, make sure your system is running on any of the following operating systems − Any of Linux OS − Supports development and deployment. It is preferred for demo applications. Windows OS − Supports only development. Mac OS − Supports only development. ZooKeeper server is created in Java and it runs on JVM. […]
Read MoreZooKeeper Command Line Interface (CLI) is used to interact with the ZooKeeper ensemble for development purpose. It is useful for debugging and working around with different options. To perform ZooKeeper CLI operations, first turn on your ZooKeeper server (“bin/zkServer.sh start”) and then, ZooKeeper client (“bin/zkCli.sh”). Once the client starts, you can perform the following operation […]
Read MoreZooKeeper has an official API binding for Java and C. The ZooKeeper community provides unofficial API for most of the languages (.NET, python, etc.). Using ZooKeeper API, an application can connect, interact, manipulate data, coordinate, and finally disconnect from a ZooKeeper ensemble. ZooKeeper API has a rich set of features to get all the functionality […]
Read MoreLet us analyze how a leader node can be elected in a ZooKeeper ensemble. Consider there are N number of nodes in a cluster. The process of leader election is as follows − All the nodes create a sequential, ephemeral znode with the same path, /app/leader_election/guid_. ZooKeeper ensemble will append the 10-digit sequence number to […]
Read MoreZooKeeper is a distributed co-ordination service to manage large set of hosts. Co-ordinating and managing a service in a distributed environment is a complicated process. ZooKeeper solves this issue with its simple architecture and API. ZooKeeper allows developers to focus on core application logic without worrying about the distributed nature of the application. The ZooKeeper […]
Read MoreZooKeeper is a distributed co-ordination service to manage large set of hosts. Co-ordinating and managing a service in a distributed environment is a complicated process. ZooKeeper solves this issue with its simple architecture and API. ZooKeeper allows developers to focus on core application logic without worrying about the distributed nature of the application. The ZooKeeper […]
Read MoreBefore going deep into the working of ZooKeeper, let us take a look at the fundamental concepts of ZooKeeper. We will discuss the following topics in this chapter − Architecture Hierarchical namespace Session Watches Architecture of ZooKeeper Take a look at the following diagram. It depicts the “Client-Server Architecture” of ZooKeeper. Each one of the […]
Read MoreOnce a ZooKeeper ensemble starts, it will wait for the clients to connect. Clients will connect to one of the nodes in the ZooKeeper ensemble. It may be a leader or a follower node. Once a client is connected, the node assigns a session ID to the particular client and sends an acknowledgement to the […]
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