Exploiting Laziness for Improving Performance in Data Replication Management
Hu, Kexiang
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https://hdl.handle.net/2142/81986
Description
Title
Exploiting Laziness for Improving Performance in Data Replication Management
Author(s)
Hu, Kexiang
Issue Date
2000
Doctoral Committee Chair(s)
Sharad Mehrotra
Department of Study
Computer Science
Discipline
Computer Science
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
Computer Science
Language
eng
Abstract
In this dissertation, we study how to best explore laziness in data replication for the purpose of performance optimization without sacrificing the ability for fault-tolerance. We also study techniques to deal with various types of failures to ensure transaction durability. First, we propose an Optimized 2-Safe (o2-safe) approach for multi-processor primary-backup systems that combines the best features of both lazy and eager designs by careful addition of partial synchrony in the log transfer protocol. The approach presented achieves high throughput during normal processing (similar to lazy methods) without risking loss of transactions in case of primary failures (similar to eager methods). The failure-handling techniques developed are able to handle both partial as well as complete system failures and guarantee continued availability of a database partition as long as both the primary and its corresponding backup do not fail simultaneously. We then explore a new Optimized Eager-Master (OEM) approach which extends the o2-safe technique to general data replication problems. The resulting OEM approach ensures transaction durability with much improved performance over eager approaches. Furthermore, the non-blocking commit protocol, along with the techniques developed for handling site failures, enables a backup to take over in the event of a failure to provide continued availability. Performance studies further confirm the viability of the proposed approaches.
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