Search engine benchmark (Tantivy, Lucene, PISA, ...)

Utility scripts for running Lucene performance tests, and 15 years of nightly benchmarks

Le code civil français sous git

Image recognition open source index and search engine

A massively spiffy yet delicately unobtrusive compression library.

A simple JMH benchmark for various versions of t-digest

The Definitive Guide to Elasticsearch

New generation entropy codecs : Finite State Entropy and Huff0

A new data structure for accurate on-line accumulation of rank-based statistics such as quantiles and trimmed means

Flax-maintained fork of Lucene/Solr with support for interval queries

Random access array of tightly packed unsigned integers

Your window into all of your data

Implements common Lucene queries in C via JNI for Sizable (2-4X) speedups in certain cases

Open Source, Distributed, RESTful Search Engine with grouping

command line tool for Apache Lucene

This is a TREC evaluation demonstration written for a lecture on information retrieval evaluation.

LZ4 compression for Java

Memory consumption estimator for Java

Java port(JNI) of Snappy & LZ4 compression codec

Twgit is a free and open source assisting tools for managing features, hotfixes and releases on Git repositories. It provides simple, high-level commands to adopt the branching model describes in o…

MySQL fork maintained and used at Twitter

a column file format

Randomized Testing (Core JUnit Runner, ANT, Maven)

Pure Java implementation of the liblzo2 LZO compression algorithm

Benchmark suite for data compression library on the JVM

Comparison of trie implementations

Lucene fields and queries for interval fields.

Parallel execution of tasks for Ant

ZLib-like wrapper around LZ4/Fastlz compression library.

Free and Open Source, Distributed, RESTful Search Engine