NDLI: Relational subscription middleware for Internet-scale publish-subscribe

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Relational subscription middleware for Internet-scale publish-subscribe

Content Provider	ACM Digital Library
Author	Strom, Rob Jin, Yuhui
Abstract	We present a design of a distributed publish-subscribe system that extends the functionality of messaging middleware with "relational subscriptions", to support timely updates to state derived from published messages while preserving high throughput, scalability, and reliability.Critical to our design is our service guarantee of "eventual correctness". Eventual correctness is a weaker guarantee than the ACID properties of conventional databases, yet is useful enough to deliver state that is "just consistent enough".A key component of our design is a monotonic type system. All states delivered to clients represent facts that are permanently true, that may be refined by future updates, but will never become false. The monotonic type system is used both to formalize eventual correctness, and as a basis for our implementation, which generalizes the "Guaranteed Delivery" protocol previously implemented in the Gryphon system.We discuss: (1) our monotonic type system and relational subscription language; (2) eventual correctness; (3) the architecture of our implementation; (4) potential optimizations that form a basis for future studies.
Starting Page	1
Ending Page	8
Page Count	8
File Format	PDF
ISBN	1581138431
DOI	10.1145/966618.966638
Language	English
Publisher	Association for Computing Machinery (ACM)
Publisher Date	2003-06-08
Publisher Place	New York
Access Restriction	Subscribed
Subject Keyword	Relational subscriptions Continuous queries Event distribution systems Monotonicity
Content Type	Text
Resource Type	Article

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