Abstract
Publish/Subscribe is the paradigm in which users express long-term interests ("subscriptions") and some agent "publishes" events (e.g., offers). The job of Publish/Subscribe software is to send events to the owners of subscriptions satisfied by those events. For example, a user subscription may consist of an interest in an airplane of a certain type, not to exceed a certain price. A published event may consist of an offer of an airplane with certain properties including price. Each subscription consists of a conjunction of (attribute, comparison operator, value) predicates. A subscription closely resembles a trigger in that it is a long-lived conditional query associated with an action (usually, informing the subscriber). However, it is less general than a trigger so novel data structures and implementations may enable the creation of more scalable, high performance publish/subscribe systems. This paper describes an attempt at the construction of such algorithms and its implementation. Using a combination of data structures, application-specific caching policies, and application-specific query processing our system can handle 600 events per second for a typical workload containing 6 million subscriptions.
Original language | English (US) |
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Pages (from-to) | 115-126 |
Number of pages | 12 |
Journal | SIGMOD Record (ACM Special Interest Group on Management of Data) |
Volume | 30 |
Issue number | 2 |
DOIs | |
State | Published - Jun 2001 |
ASJC Scopus subject areas
- Software
- Information Systems