Event Index - an LHCb Event Search System
Andrey Ustyuzhanin, Alexey Artemov, Nikita Kazeev, Artem Redkin

TL;DR
Event Index is a specialized search system based on Apache Lucene, designed to efficiently retrieve specific subsets of the vast LHCb collision event data using various selection criteria.
Contribution
This paper introduces Event Index, a scalable, read-optimized event search system tailored for the large-scale LHCb dataset, enhancing data retrieval efficiency.
Findings
Enables rapid selection of event subsets based on multiple conditions
Optimized for distributed, read-only indexes across multiple nodes
Improves data accessibility for LHCb collision events
Abstract
During LHC Run 1, the LHCb experiment recorded around collision events. This paper describes Event Index - an event search system. Its primary function is to quickly select subsets of events from a combination of conditions, such as the estimated decay channel or number of hits in a subdetector. Event Index is essentially Apache Lucene optimized for read-only indexes distributed over independent shards on independent nodes.
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