V<TITLE> Strong Replication in the GlobData Middleware</TITLE>

<H1>Strong Replication in the GlobData Middleware</H1>

<EM>L. Rodrigues, H. Miranda, R. Almeida, J. Martins and P. Vicente.</EM>

<P>
Selected sections of this report will be published in the Proceedings
of the Workshop on Dependable Middleware-Based Systems, Washington
D.C., USA, June 2002. (Part of Dependable Systems and Networks
Conference, DSN 2002).
  
<P>

<H2>Abstract</H2> 

GlobData is a project that aims to design and implement a
  middleware tool offering the abstraction of a global object database
  repository. This tool, called Copla, supports transactional access
  to geographically distributed persistent objects independent of
  their location. Additionally, it supports replication of data
  according to different consistency criteria. For this purpose,
  Copla implements a number of consistency protocols offering
  different tradeoffs between performance and fault-tolerance.
  <p>
  This paper presents the work on strong consistency protocols for the
  GlobData system. Two protocols are presented: a voting protocol and
  a non-voting protocol. Both these protocols rely on the use of
  atomic broadcast as a building block to serialize conflicting
  transactions. The paper also introduces the total order protocol
  being developed to support large-scale replication.
<p>

<em>Also available extended report <A
HREF="../reports/wdms02.ps.gz">(gzip postscript)</A>, <A
HREF="../reports/wdms02.pdf">(pdf)</A> .</em>

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