Byzantine fault tolerant web applications using the UpRight library

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Title: Byzantine fault tolerant web applications using the UpRight library
Author: Rebello, Rohan Francis
Abstract: Web applications are widely used for email , online sales , auctions , collaboration , etc . Most of today’s highly -available web applications implement fault tolerant protocols in order to tolerate crash faults . However , recent system -wide failures have been caused by arbitrary or Byzantine faults which these applications are not capable of handling . Despite the abundance of research on adding Byzantine fault tolerance (BFT ) to a system , BFT systems have found little use outside the research community . Reasons typically cited for this are the difficulty in implementing such systems and the performance overhead associated with them . While most research focuses on improving the performance or lowering the replication cost of BFT protocols , little has been done on making them easy to implement . The goal of this thesis is to evaluate the viability of BFT web applications and show that , given the right abstraction , it is viable to build a Byzantine fault tolerant web application without extensive reimplementation of the web application . In order to achieve this goal , it demonstrates a BFT implementation of the Apache Tomcat servlet container and the VQWiki web application by using the UpRight BFT library . The UpRight library provides abstractions that make it easy to develop BFT applications and we leverage this abstraction to reduce the implementation cost of our system . Our results are encouraging — less than 2 % of the original system needs to be modified while still retaining all the functionality of the original system . Given the design trade -offs that we make in implementing the system , we also get comparable performance , indicating that implementing BFT is a viable option to explore for highly -available web applications .
URI: http : / /hdl .handle .net /2152 /ETD -UT -2009 -08 -362
Date: 2010-06-04

Citation

Byzantine fault tolerant web applications using the UpRight library. Master's thesis, The University of Texas at Austin. Available electronically from http : / /hdl .handle .net /2152 /ETD -UT -2009 -08 -362 .

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