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          University of California at Santa Cruz
Baskin Center for Computer Engineering and Information Sciences 

The following technical report is available electronically or as
a paper copy.  Instructions for getting either follow the abstract.

UCSC-CRL-92-31   (available electronically as ucsc-crl-92-31.ps.Z)
A WEAK-CONSISTENCY ARCHITECTURE FOR DISTRIBUTED INFORMATION SERVICES
Richard A. Golding
July 1992, 17 pages (paper copy $5.00)
Abstract:  
Services provided on wide-area networks like the Internet present
several challenges.  The reliability, performance, and scalability
expected of such services often requires they be implemented using
multiple, replicated servers.  One possible architecture implements
the replicas as a weak-consistency process group. This architecture 
provides good scalability and availability, handles portable computer 
systems, and minimizes the effect of users on each other.  The key 
principles in this architecture are component independence, a process 
group protocol that provides small summaries of database contents, 
caching database slices, and the quorum multicast client-to-server 
communication protocol.  A distributed bibliographic database system 
serves as an example.

This technical report is available electronically through either 
of the following methods:
1.  through anonymous ftp from ftp.cse.ucsc.edu, in /pub/tr. Log in 
    as "anonymous", use your email address as your password, specify 
    "binary" before getting the file.  Uncompress before printing.
2.  by mail to automatic mail server rnalib@ftp.cse.ucsc.edu.
    Put this command on the subject line or in the body of the message:
	@@ send ucsc-crl-92-31.ps.Z from tr
    To get the index or abstract list:
	@@ send INDEX from tr
	@@ send ABSTRACTS.1992 from tr
    To get the list of the tr directory:
	@@ list tr
    To get the list of commands and their syntax:
	@@ help commands

Order paper copies from:  Technical Library, Baskin Center for Computer 
Engineering & Information Sciences, UCSC, Santa Cruz  CA  95064.
Purchase orders are not accepted.  Checks or money orders must be
for U.S. dollars, payable through a U.S. bank, and made out to 
"UC Regents".

Questions:  jean@cse.ucsc.edu

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Co-moderator:  Richard Golding, Computer & Information Sciences, UC Santa Cruz
	    compdoc-techreports-request@ftp.cse.ucsc.edu