USENIX Technical Program - Abstract - COOTS 99
Implementing Causal Logging Using OrbixWeb Interception
Chanathip Namprempre, Jeremy Sussman, and Keith Marzullo, University of California, San Diego
Some form of replicated data management is a basic service of nearly all distributed
systems. Replicated data management maintains the consistency of replicated data. In
wide-area distributed systems, causal consistency is often used, because it is strong
enough to allow one to easily solve many problems while still keeping the cost low even
with the large variance in latency that one finds in a wide-area network. Causal
logging is a useful technique for implementing causal consistency because it greatly
reduces the latency in reading causally consistent data by piggybacking updates on
existing network traffic.
We have implemented a CORBA service, called COPE, that is implemented by using
causal logging. COPE also shares features with some CORBA security services and is
naturally implemented using the OrbixWeb interception facilities. In implementing
COPE in OrbixWeb, we encountered several problems. We discuss COPE, its
implementation in OrbixWeb, and the problems we encountered in this paper. We hope
that this discussion will be of interest to both those who are implementing and who are
planning on using CORBA interception facilities.
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