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Please use this identifier to cite or link to this item: http://hdl.handle.net/1942/16393

Title: Weaker Forms of Monotonicity for Declarative Networking: a more fine-grained answer to the CALM-conjecture
Authors: Ameloot, Tom
Ketsman, Bas
Neven, Frank
Zinn, Daniel
Issue Date: 2014
Citation: Proceedings of the 33rd ACM Symposium on Principles of Database Systems
Abstract: The CALM-conjecture, first stated by Hellerstein [23] and proved in its revised form by Ameloot et al. [13] within the framework of relational transducer networks, asserts that a query has a coordination-free execution strategy if and only if the query is monotone. Zinn et al. [32] extended the framework of relational transducer networks to allow for specific data distribution strategies and showed that the nonmonotone win-move query is coordination-free for domainguided data distributions. In this paper, we complete the story by equating increasingly larger classes of coordinationfree computations with increasingly weaker forms of monotonicity and make Datalog variants explicit that capture each of these classes. One such fragment is based on stratified Datalog where rules are required to be connected with the exception of the last stratum. In addition, we characterize coordination-freeness as those computations that do not require knowledge about all other nodes in the network, and therefore, can not globally coordinate. The results in this paper can be interpreted as a more fine-grained answer to the CALM-conjecture.
Notes: Neven, F (reprint author), Hasselt Univ, Comp Sci, Hasselt, Belgium. frank.neven@uhasselt.be
URI: http://hdl.handle.net/1942/16393
DOI: 10.1145/2594538.2594541
ISBN: 9781450320665
Category: C1
Type: Proceedings Paper
Appears in Collections: Research publications

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