Apache ZooKeeper Essentials by Saurav Haloi

By Saurav Haloi

A fast paced advisor to utilizing Apache ZooKeeper to coordinate providers in disbursed systems

About This Book

  • Learn the fundamentals of Apache ZooKeeper with a accomplished exam of its internals and administration
  • Explore the ZooKeeper API version and methods to boost purposes utilizing ZooKeeper in C, Java, and Python for universal disbursed coordination tasks
  • See how ZooKeeper is utilized in real-world functions and providers to hold out advanced disbursed coordination tasks

Who This ebook Is For

Whether you're a beginner to ZooKeeper or have already got a few event, it is possible for you to to grasp the suggestions of ZooKeeper and its utilization with ease.

This ebook assumes you to have a few past wisdom of allotted structures and high-level programming wisdom of C, Java, or Python, yet no event with Apache ZooKeeper is required.

What you'll Learn

  • Understand how Apache ZooKeeper solves coordination matters in conventional dispensed systems
  • Discover steps to establish and start with ZooKeeper in a improvement surroundings as well as production
  • Explore ZooKeeper's structure and internals
  • Get to grips with the API version of ZooKeeper to begin programming
  • Use ZooKeeper to resolve universal disbursed coordination initiatives corresponding to chief election, dispensed queues, and team memberships
  • Administer Apache ZooKeeper for real-world use and construction workload
  • Investigate using ZooKeeper in real-world functions and services

In Detail

Apache ZooKeeper offers an easy interface to a centralized coordinating provider for allotted functions via a wealthy set of APIs and primitives, allowing builders to pay attention to the center good judgment in their purposes. With ZooKeeper, it really is pointless to begin from scratch, so the advance of dispensed functions turns into purifier and easier.

Starting with the way to set up, configure, and start with ZooKeeper, we will learn the intricacies of ZooKeeper's structure and internals. subsequent, you will study ZooKeeper's programming version and write code to resolve universal dispensed coordination projects. we will additionally stroll you thru administering ZooKeeper in a creation setting, sooner than ultimately overlaying sensible examples of real-world tasks and prone utilizing ZooKeeper to unravel advanced day by day problems.

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Extra resources for Apache ZooKeeper Essentials

Sample text

We will create three different data folders for the instances, say zoo1, zoo2, and zoo3, in /var/lib/zookeeper. Thus, the three configuration files are shown next. 3=localhost:2668:3668 We also need to fix the server ID parameter correctly in the myid file for each instance. This can be done using the following three commands: $ echo 1 > /var/lib/zookeeper/zoo1/myid $ echo 2 > /var/lib/zookeeper/zoo2/myid $ echo 3 > /var/lib/zookeeper/zoo3/myid Now, we are all set to start the ZooKeeper instances.

Sessions play a very important role in ZooKeeper. For example, the whole notion of ephemeral znodes is based on the concept of sessions between the client and the ZooKeeper server. Ephemeral znodes have the lifetime of a session being active between a client and ZooKeeper; when this session ends, these nodes are automatically deleted by the ZooKeeper service. A session has a timeout period, which is specified by the application or the client while connecting to the ZooKeeper service. The client sends a requested timeout as a parameter in the create connection call to create a ZooKeeper, which is specified in milliseconds.

Chapter 1 To see if Java is installed on your system, run the following command: $ java –version If Java is installed and its path is configured properly, then depending on the version and release of Java (Oracle or OpenJDK), the preceding command will show the version of Java and Java Runtime installed on your system. 67 installed. 65-b04, mixed mode) ZooKeeper needs the JAVA_HOME environment variable to be set correctly. To see if this is set in your system, run the following command: $ echo $JAVA_HOME On my system, JAVA_HOME is set to /usr/java/latest, and hence, I got the following output: $ echo $JAVA_HOME /usr/java/latest Starting the ZooKeeper server Now, considering that Java is installed and working properly, let's go ahead and start the ZooKeeper server.

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