Welcome to Apache ZooKeeper™ Apache ZooKeeper is an effort to develop and maintain an open-source server which enables highly reliable distributed coordination. What is ZooKeeper? ZooKeeper is a centralized service for maintaining configuration information, naming, providing distributed synchronization, and providing group services.
ZooKeeper ZooKeeper: A Distributed Coordination Service for Distributed Applications Design Goals Data model and the hierarchical namespace Nodes and ephemeral nodes Conditional updates and watches Guarantees Simple API Implementation Uses Performance Reliability The ZooKeeper Project ZooKeeper: A Distributed Coordination Service for Distributed Applications ZooKeeper is a distributed, open ...
ZooKeeper logs messages using log4j -- more detail available in the Logging section of the Programmer's Guide. You will see log messages coming to the console (default) and/or a log file depending on the log4j configuration.
To keep the examples simple, we create a ZooKeeper object the first time we instantiate either a barrier object or a queue object, and we declare a static variable that is a reference to this object. The subsequent instances of Barrier and Queue check whether a ZooKeeper object exists.
This section contains information about running and maintaining ZooKeeper and covers these topics: Designing a ZooKeeper Deployment Provisioning Things to Consider: ZooKeeper Strengths and Limitations Administering Maintenance Monitoring Logging Troubleshooting Configuration Parameters ZooKeeper Commands: The Four Letter Words Data File Management Things to Avoid Best Practices Designing a ...
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