Topic_2_FT - REPLICATION MANAGEMENT AND GOOGLE FILE SYSTEMS...

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CS3283 Distributed Systems Lecturer: Dr. K. Y. Lam Chung Wing Ho 51320867 Hung Yuk Man 51241471 Louie Ting Kit 51265825 Yip Kai Wing 51369534 REPLICATION MANAGEMENT AND GOOGLE FILE SYSTEMS
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REPLICATION Creating and maintaining multiple copies of data/object at multiple locations Files, file system, database, etc. Group of processes to handle incoming events E.g. Caching in web server, proxy servers, DNS
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MANAGEMENT OF REPLICATED DATA Clients Requests for services Front ends Filter requests and determine RMs Replica managers Maintain and operate directly on replicas Five phases Request, coordination, execution, agreement, response
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MODEL OF REPLICATION Active replication (State machine replication) Replica manager (RM) function as groups Request are multicast to the group All RM reply independently Passive replication (Primary-backup replication) Single primary RM and a couple of backup (slaves) RM Primary RM handle the request and send copies to slaves Replicas are needed for the operations Increase throughput Guarantee availability Load balancing
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DIFFICULTIES Redundancy problems Number of replicas
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This note was uploaded on 01/17/2011 for the course CS CS3283 taught by Professor Kylam during the Spring '10 term at City University of Hong Kong.

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Topic_2_FT - REPLICATION MANAGEMENT AND GOOGLE FILE SYSTEMS...

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