NDLI: QoS-Aware Middleware for Scalable Replication

Content Provider	IEEE Xplore Digital Library
Author	Al-Ekram, R. Holt, R.
Copyright Year	2011
Abstract	When using replication as a technique for achieving high performance and scalability, optimistic replication is the natural choice. But optimistic replication introduces uncertainty that may lead to confusion in the clients. For example consecutive requests from the same client may be processed out of order, or the answer from a query might be too old to be useful to the client, or an operation may cause unwanted side-effect in the system when the client times out due to long response time. In such situations the clients can benefit from being allowed to specify their tolerable levels of uncertainty, in other words their desired quality-of-service (QoS) from the system. This paper introduces a novel optimistic replication protocol QRep with its QoS-aware middleware that allows the clients' to specify the following three QoS parameters: (1) session guarantee, (2) freshness and (3) deadline. QRep attempts to fulfill the specified QoS while processing the requests. QRep supports both synchronous and asynchronous clients. We carried out experiments to demonstrate the effectiveness of the protocol in terms of both QoS fulfillment and scalability. We also demonstrated that there is no significant performance penalty for providing the QoS.
Starting Page	13
Ending Page	20
File Size	683965
Page Count	8
File Format	PDF
ISBN	9781612848297
DOI	10.1109/WAINA.2011.33
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2011-03-22
Publisher Place	Singapore
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Protocols Uncertainty Scalability QoS Quality of service Replication Synchronization Middleware
Content Type	Text
Resource Type	Article

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