On-demand Replication for High Availability in Content-based Publish/Subscribe Overlays
Content-based publish/subscribe overlays o®er a scalable mes-
saging substrate for various event-based distributed systems. In an enter-
prise environment where service level agreements are strictly enforced,
maintaining high availability of the broker overlay is critical. To meet
this requirement, protocols are developed to replace or load-balance a
broker that misbehaves|perhaps due to failure, congestion, or peri-
odic maintenance|with a new broker in a running system. The key
to our techniques is distributed replication of routing information on an
adaptively deployed new broker which serves reliable re-route or alter-
native paths for publication messages. Our techniques focuses on avoid-
ing lengthy disruption of messaging service, and supporting consistency
properties on publication delivery via the replica.
Tags: content-based publish/subscribe, cloud computing, replication, high availability
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