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Robust and Scalable Content-and-Structure Indexing

Abstract : Frequent queries on semi-structured hierarchical data are Content-and-Structure (CAS) queries that filter data items based on their location in the hierarchical structure and their value for some attribute. We propose the Robust and Scalable Content-and-Structure (RSCAS) index to efficiently answer CAS queries on big semi-structured data. To get an index that is robust against queries with varying selectivities we introduce a novel dynamic interleaving that merges the path and value dimensions of composite keys in a balanced manner. We store interleaved keys in our triebased RSCAS index, which efficiently supports a wide range of CAS queries, including queries with wildcards and descendant axes. We implement RSCAS as a log-structured merge (LSM) tree to scale it to data-intensive applications with a high insertion rate. We illustrate RSCAS's robustness and scalability by indexing data from the Software Heritage (SWH) archive, which is the world's largest, publiclyavailable source code archive.
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https://hal.archives-ouvertes.fr/hal-03787268
Contributor : Stefano Zacchiroli Connect in order to contact the contributor
Submitted on : Saturday, September 24, 2022 - 2:44:16 PM
Last modification on : Friday, September 30, 2022 - 5:33:18 PM

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  • HAL Id : hal-03787268, version 1

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Kevin Wellenzohn, Michael H. Böhlen, Sven Helmer, Antoine Pietri, Stefano Zacchiroli. Robust and Scalable Content-and-Structure Indexing. The VLDB Journal, inPress. ⟨hal-03787268⟩

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