ZooKeeper介绍.ppt

HUG – India Meet
November 28, 2009
Noida
Apache ZooKeeper
Aby Abraham
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Agenda
Overview of Zookeeper
Use cases and examples
Essential internals
Future directions
Related works and references
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What is Zookeeper?
A scalable, distributed, open-source coordination service for distributed applications
Provides a simple set of primitives to implement higher level services for synchronization, configuration maintenance, consensus, leader election, groups and naming in a distributed system.
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Why Use Zookeeper?
If you love to have sleepless nights debugging distributed synchronization problems – please ignore the rest of the presentation
Difficulty of implementing distributed plex distributed algorithms are notoriously difficult to implement correctly
Prone to race conditions and dead locks. And distributed deadlocks are the worst!
Different implementations lead to plexity when the applications are deployed
Other programming models using distributed locks or State Machine Replication are difficult to use correctly
Zookeeper solves these problems for us by providing a simple and already familiar programming model
Zookeeper provides reusable code libraries mon use cases – very easy to use
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Who uses Zookeeper?
Deepdyve - Does search for research and provide access to high quality content using advanced search technologies. ZK is used to manage server state, control index deployment and a myriad other tasks
Katta - Katta serves distributed Lucene indexes in a grid environment. ZK is used for node, master and index management in the grid
101tec – Does consulting in the area of enterprise distributed systems. Uses ZK to manage a system build out of hadoop, katta, oracle batch jobs and a ponent
Hbase – HBase is an open-source distributed column-oriented dat