Parallel-Correctness and Transferability for Conjunctive Queries

Author:

Ameloot Tom J.1,Geck Gaetano2,Ketsman Bas1,Neven Frank1,Schwentick Thomas2

Affiliation:

1. Hasselt University 8 transnational University of Limburg, Hasselt, Belgium

2. TU Dortmund University, Otto-Hahn-Straße, Dortmund

Abstract

A dominant cost for query evaluation in modern massively distributed systems is the number of communication rounds. For this reason, there is a growing interest in single-round multiway join algorithms where data are first reshuffled over many servers and then evaluated in a parallel but communication-free way. The reshuffling itself is specified as a distribution policy. We introduce a correctness condition, called parallel-correctness , for the evaluation of queries w.r.t. a distribution policy. We study the complexity of parallel-correctness for conjunctive queries as well as transferability of parallel-correctness between queries. We also investigate the complexity of transferability for certain families of distribution policies, including the Hypercube distribution policies.

Funder

Research Foundation-Flanders

Publisher

Association for Computing Machinery (ACM)

Subject

Artificial Intelligence,Hardware and Architecture,Information Systems,Control and Systems Engineering,Software

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