dipLODocus[RDF]: Short and Long-Tail RDF Analytics for Massive Webs of Data

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dipLODocus[RDF] is a new system for RDF data processing supporting both simple transactional queries and complex analytics efficiently. dipLODocus[RDF] is based on a novel hybrid storage model considering RDF data both from a graph perspective (by storing RDF subgraphs or RDF molecules) and from a "vertical" analytics perspective (by storing compact lists of literal values for a given attribute). http://diuf.unifr.ch/main/xi/diplodocus/

Short and Long-Tail RDF Analytics for
Massive Webs of Data
Marcin Wylot, Jigé Pont, Mariusz Wiśniewski,
and Philippe Cudré-Mauroux
eXascale Infolab, University of Fribourg
Switzerland
International Semantic Web Conference
26th October 2011, Bonn, Germany

Motivation

● increasingly large semantic/LoD data sets
● increasingly complex queries
○ real time analytic queries
■ like “returning professor who supervises the most students”

urgent need for more efficient and scalable
solution for RDF data management

3 recipes to speed-up

○collocation
○collocation

3 recipes to speed-up

○collocation
○collocation
○collocation

Why collocation??
Because by collocating data together we
can reduce IO operations, which are
one of the biggest bottlenecks in
database systems.

Outline
● architecture
● main idea
● data structures
● basic operations (inserts, queries)
● evaluation & results
● future work

Molecule Clusters
● extremely compact sub-graphs
● precomputed joins

List of Literals
● extremely compact list of sorted values

Hash Table
lexicographic tree
to encode URIs

template based
indexing

extremely compact lists of
homologous nodes

Basic operations - inserts
n-pass algorithm

Basic operations - queries - triple patterns
?x type Student.
?x takesCourse Course0.

?x type Student.
?x takesCourse Course0.
?x takesCourse Course1.

=> intersection of sorted lists

Basic operations - queries - molecule queries

?a name 'Student1'.
?a ?b ?c.
?c ?d ?e.

Basic operations - queries
aggregates and analytics
?x type Student.
?x age ?y
filter (?y < 21)

Performance Evaluation
We used the Lehigh University Benchmark.
We generated two datasets, for 10 and 100 Universities.
● 1 272 814 distinct triples and 315 003 distinct strings
● 13 876 209 distinct triples and 3 301 868 distinct strings

We compared the runtime execution for 14 LUBM queries
and 3 analytic queries inspired from BowlognaBench.
● returning professor who supervises the most students
● returning big molecule containing everything around
Student0 within scope 2
● returning names for all graduate students

Future work
● open source
○ cleaning code
○ extending code
● parallelising operations
○ multi-core architecture
○ cloud
● automated database design

Conclusions
● advanced data collocation
○ molecules, RDF sub-graphs
○ lists of literals, compact sorted list of values
○ hash table indexed by templates
● slower inserts and updates
○ compact ordered structures
○ data redundancy
● 30 times faster on LUBM queries
● 350 times faster on analytic queries

Transitivity

● Inheritance Manager
○ typeX subClassOf

● Query
○ ?z type typeY
■ ?z type typeY
■ ?z type typeX

● subClassOf
● subPropertyOf

typeY

Serialising Molecules

#TEMPLATES * TEMPLATE_SIZE + #TRIPLES * KEY_SIZE
#TEMPLATES - the number of templates in the molecule
TEMPLATE_SIZE - the size of a key in bytes
#TRIPLES - the number of triples in the molecule
KEY_SIZE - the size of a key in bytes, for example 8 in our case (Intel 64, Linux)

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