DKWS: A Distributed System for Keyword Search on Massive Graphs

Jiaxin Jiang, Byron Choi*, Xin Huang, Jianliang Xu, Sourav S. Bhowmick

*Corresponding author for this work

Research output: Contribution to journalJournal articlepeer-review

Abstract

Due to the unstructuredness and the lack of schemas of graphs, such as knowledge graphs, social networks, and RDF graphs, keyword search for querying such graphs has been proposed. As graphs have become voluminous, large-scale distributed processing has attracted much interest from the database research community. While there have been several distributed systems, distributed querying techniques for keyword search are still limited. This paper proposes a novel distributed keyword search system called DKWS . First, we present a monotonic property with keyword search algorithms that guarantees correct parallelization. Second, we present a keyword search algorithm as monotonic backward and forward search phases. Moreover, we propose new tight bounds for pruning nodes being searched. Third, we propose a notify-push paradigm and PINE programming model of DKWS . The notify-push paradigm allows asynchronously exchanging the upper bounds of matches across the workers and the coordinator in DKWS . The PINE programming model naturally fits keyword search algorithms, as they have distinguished phases, to allow preemptive searches to mitigate staleness in a distributed system. Finally, we investigate the performance and effectiveness of DKWS through experiments using real-world datasets. We find that DKWS is up to two orders of magnitude faster than related techniques, and its communication costs are 7.6 times smaller than those of other techniques.

Original languageEnglish
Pages (from-to)1-16
Number of pages16
JournalIEEE Transactions on Knowledge and Data Engineering
DOIs
Publication statusE-pub ahead of print - 25 Sept 2023

Scopus Subject Areas

  • Information Systems
  • Computer Science Applications
  • Computational Theory and Mathematics

User-Defined Keywords

  • Keyword search
  • Knowledge graphs
  • Pipelines
  • Programming
  • Semantics
  • Synchronization
  • Upper bound

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