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Parallel query processing in a polystore


The blooming of different data stores has made polystores a major topic in the cloud and big data landscape. As the amount of data grows rapidly, it becomes critical to exploit the inherent parallel processing capabilities of underlying data stores and data processing platforms. To fully achieve this, a polystore should: (i) preserve the expressivity of each data store’s native query or scripting language and (ii) leverage a distributed architecture to enable parallel data integration, i.e. joins, on top of parallel retrieval of underlying partitioned datasets. In this paper, we address these points by: (i) using the polyglot approach of the CloudMdsQL query language that allows native queries to be expressed as inline scripts and combined with SQL statements for ad-hoc integration and (ii) incorporating the approach within the LeanXcale distributed query engine, thus allowing for native scripts to be processed in parallel at data store shards. In addition, (iii) efficient optimization techniques, such as bind join, can take place to improve the performance of selective joins. We evaluate the performance benefits of exploiting parallelism in combination with high expressivity and optimization through our experimental validation.

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This research has been partially funded by the European Union's Horizon 2020 Programme, project BigDataStack (Grant 779747), project INFINITECH (Grant 856632), project PolicyCLOUD (Grant 870675), by the Madrid Regional Council, FSE and FEDER, project EDGEDATA (P2018/TCS-4499), CLOUDDB project TIN2016-80350-P (MINECO/FEDER, UE), and industrial doctorate grant for Pavlos Kranas (IND2017/TIC-7829). Prof. Jose Pereira, Ricardo Vilaça, and Rui Gonçalves contributed to this work when they were with LeanXcale.

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Correspondence to Boyan Kolev.

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Kranas, P., Kolev, B., Levchenko, O. et al. Parallel query processing in a polystore. Distrib Parallel Databases 39, 939–977 (2021).

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  • Database integration
  • Heterogeneous databases
  • Distributed and parallel databases
  • Polystores
  • Query languages
  • Query processing