Event Index - an LHCb Event Search System

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 $10^{11}$ 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.