Top 5 Java Olap Projects

doris

42 11,272 10.0 Java

Apache Doris is an easy-to-use, high performance and unified analytics database.

Project mention: Variant in Apache Doris 2.1.0: a new data type 8 times faster than JSON for semi-structured data analysis | dev.to | 2024-03-27

As an open-source real-time data warehouse, Apache Doris provides semi-structured data processing capabilities, and the newly-released version 2.1.0 makes a stride in this direction. Before V2.1, Apache Doris stores semi-structured data as JSON files. However, during query execution, the real-time parsing of JSON data leads to high CPU and I/O consumption in addition to high query latency, especially when the dataset is huge and complicated. Moreover, the lack of a pre-defined schema means there is no handle for query optimization.
starrocks

12 7,726 10.0 Java

StarRocks, a Linux Foundation project, is a next-generation sub-second MPP OLAP database for full analytics scenarios, including multi-dimensional analytics, real-time analytics, and ad-hoc queries. InfoWorld’s 2023 BOSSIE Award for best open source software.

Project mention: A MySQL compatible database engine written in pure Go | news.ycombinator.com | 2024-04-09

tidb has been around for a while, it is distributed, written in Go and Rust, and MySQL compatible. https://github.com/pingcap/tidb
Somewhat relatedly, StarRocks is also MySQL compatible, written in Java and C++, but it's tackling OLAP use-cases. https://github.com/StarRocks/starrocks
InfluxDB

www.influxdata.com
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Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
Crate

6 3,952 9.9 Java

CrateDB is a distributed and scalable SQL database for storing and analyzing massive amounts of data in near real-time, even with complex queries. It is PostgreSQL-compatible, and based on Lucene.

Project mention: FLaNK AI - 01 April 2024 | dev.to | 2024-04-01
mondrian

2 1,118 5.4 Java

Mondrian is an Online Analytical Processing (OLAP) server that enables business users to analyze large quantities of data in real-time.
doris-flink-connector

2 274 9.0 Java

Flink Connector for Apache Doris

Project mention: Auto-Synchronizing an Entire MySQL Database for Data Analysis | dev.to | 2023-09-01

Download JAR file: https://github.com/apache/doris-flink-connector/releases/tag/1.4.0
WorkOS

workos.com
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The modern identity platform for B2B SaaS. The APIs are flexible and easy-to-use, supporting authentication, user identity, and complex enterprise features like SSO and SCIM provisioning.

NOTE: The open source projects on this list are ordered by number of github stars. The number of mentions indicates repo mentiontions in the last 12 Months or since we started tracking (Dec 2020). The latest post mention was on 2024-04-09.