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Open Source Cloud Data Warehouses using Java

A curated collection of the best open source cloud-based databases designed for analytical workloads. using Java.

ClickHouse

Lightning-fast analytics for massive datasets

  • Stars

    50,677

  • Last commit

    3 hours ago

  • License

    Apache-2.0
High-performance columnar OLAP database system for real-time analytics on big data, with SQL support and linear scalability.

Open Source Alternative to:

Snowflake

Apache Pinot

Distributed OLAP database for real-time analytics at scale

  • Stars

    6,169

  • Last commit

    3 hours ago

  • License

    Apache-2.0
Sub-second SQL queries on fresh streaming data at petabyte scale, built for high-concurrency user-facing apps and AI agent backends.

Open Source Alternative to:

Splunk
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