tumblr / colossus   0.11.0

Contributors Wanted Apache License 2.0 GitHub

I/O and Microservice library for Scala

Scala versions: 2.12 2.11


Build Status

Maven Central


Colossus is a lightweight I/O framework for building Scala services.


Full documentation can be found here: https://tumblr.github.io/colossus

For general discussion and Q&A, check out the Google Group.

Colossus takes part in the TechEmpower web framework benchmarks under the JSON serialization and Plaintext tests.

Here's an overview of what you can find in this repo:

  • colossus : The framework
  • colossus-metrics : high-performance metrics library (does not depend on colossus)
  • colossus-examples : A few simple examples that can be run
  • colossus-testkit : Small library containing a few useful tools for testing
  • colossus-tests : The unit and integration tests for colossus
  • colossus-docs : Markdown documentation


Copyright 2016 Tumblr Inc.

Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at


Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.