Middleware support for locality-aware wide area replication

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Publication Type technical report
School or College College of Engineering
Department Computing, School of
Program Advanced Research Projects Agency
Creator Susarla, Sai R.; Carter, John
Title Middleware support for locality-aware wide area replication
Date 2004-11-18
Description Coherent wide-area data caching can improve the scalability and responsiveness of distributed services such as wide-area file access, database and directory services, and content distribution. However, distributed services differ widely in the frequency of read/write sharing, the amount of contention between clients for the same data, and their ability to make tradeoffs between consistency and availability. Aggressive replication enhances the scalability and availability of services with read-mostly data or data that need not be kept strongly consistent. However, for applications that require strong consistency of writeshared data, you must throttle replication to achieve reasonable performance. We have developed a middleware data store called Swarm designed to support the widearea data sharing needs of distributed services. To support the needs of diverse distributed services, Swarm provides: (i) a failure-resilient proximity-aware data replication mechanism that adjusts the replication hierarchy based on observed network characteristics and node availability, (ii) a customizable consistency mechanism that allows applications to specify allowable consistency-availability tradeoffs, and (iii) a contention-aware caching mechanism that monitors contention between replicas and adjusts its replication policies accordingly. On a 240-node P2P file sharing system, Swarm's proximity-aware caching and replica hierarchy maintenance mechanisms improve latency by 80%, reduce WAN bandwidth consumed by 80%, and limit the impact of high node churn (5 node deaths/sec) to roughly one-fifth that of random replication. In addition, Swarm's contention-aware caching mechanism outperforms RPCs and static caching mechanisms at all levels of contention on an enterprise service workload.
Type Text
Publisher University of Utah
Subject Wide-area data caching; Distributed services
Subject LCSH Wide area networks (Computer networks); Middleware
Language eng
Bibliographic Citation Susarla, Sai R.; Carter, John (2004). Middleware support for locality-aware wide area replication. UUCS-04-017.
Series University of Utah Computer Science Technical Report
Relation is Part of ARPANET
Rights Management ©University of Utah
Format Medium application/pdf
Format Extent 864,814 bytes
Source University of Utah School of Computing
ARK ark:/87278/s67s868q
Setname ir_uspace
Date Created 2012-06-13
Date Modified 2015-04-23
ID 705835
Reference URL https://collections.lib.utah.edu/ark:/87278/s67s868q
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