Building a robust Zookeeper client : connection management

To support high available Zookeeper service, we need to configure Zookeeper ensemble. But this is not enough. we need to understand how client manages connection to Zookeeper server. For test, I set up a Zookeeper ensemble. (port : 2181, 2182, 2183) After then, write a test client with 2 important parameters - 1) connect string …

Programming Zookeeper – Watcher

The common pattern of Zookeeper is 1) to check existence of a znode or 2) to read a znode data. Let's suppose that you are building a program which does some action whenever a znode data is changed. The way to implement it is 1) to read the znode data periodically or 2) to get …

Programming Zookeeper – Connecting to Zookeeper

When programming Zookeeper in Java, Zookeeper client or Curator is used. Zookeeper client is embedded in Zookeeper server library Curator is a wrapper for Zookeeper client, which enables easier programming There are something to consider when programming Zookeeper. The first point is connecting to Zookeeper. Let's suppose that you make a program which connects to …

Building Zookeeper cluster

Zookeeper is a cluster management solution. Therefore, Zookeeper needs to be set up as a cluster. If not, it can be the Single Point of Failure. Zookeeper cluster is called "ensemble". How to set up ensemble (based on v3.4.10) Basic config for a single Zookeeper is as follows. To change it into ensemble, add some …

The use of Zookeeper

Zookeeper was developped to support Hadoop cluster. Afterward, it has become an independent cluster management solution, although it is still used as Hadoop cluster manager. I used Zookeeper as a cache cluster management solution which has nothing to do with Hadoop. Now, I'm showing you some use of Zookeeper. Basic knowledge Zookeeper keeps internal data …