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The big data serving engine - Store, search, rank and organize big data at user serving time. Vespa is an engine for low-latency computation over large data sets. It stores and indexes your data and executes distributed queries including evaluation of machine-learned models over many data points in real time.

Travis-CI build status: Build Status

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Use cases such as search, recommendation and personalization need to select a subset of data in a large corpus, evaluate machine-learned models over the selected data, organize and aggregate it and return it, typically in less than 100 milliseconds, all while the data corpus is continuously changing.

This is hard to do, especially with large corpuses that needs to be distributed over multiple nodes and evaluated in parallel. Vespa is a platform which performs these operations for you. It has been in development for many years and is used on a number of large internet services and apps which serve hundreds of thousands of queries from Vespa per second.


To get started using Vespa pick one of the quick start documents:


Full documentation is available on


We welcome contributions! See to learn how to contribute.

If you want to contribute to the documentation, see


You do not need to build Vespa to use it, but if you want to contribute you need to be able to build the code. This section explains how to build and test Vespa. To understand where to make changes, see Some suggested improvements with pointers to code are in

Development environment

C++ and Java building is supported on CentOS 7. The Java source can also be built on any platform having Java 11 and Maven installed. Use the following guide to setup a complete development environment using Docker for building Vespa, running unit tests and running system tests: Vespa development on CentOS 7.

Build Java modules

export MAVEN_OPTS="-Xms128m -Xmx1024m"
./ java
mvn install --threads 1C

Use this if you only need to build the Java modules, otherwise follow the complete development guide above.

Build RPM packages

See Building Vespa RPM for details.


Code licensed under the Apache 2.0 license. See LICENSE for terms.

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