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Open Sourcing Wallaroo

I’m very excited to announce the first open source, public release of our ultrafast and elastic data processing engine, Wallaroo. In this post, I’m going to give you an overview of what Wallaroo is, where we are taking it, where it is now and how you can start using it.

What is Wallaroo?

Wallaroo is an ultrafast and elastic data processing engine that rapidly takes you from prototype to production by making the infrastructure virtually disappear. We’ve designed it to handle demanding high-throughput, low-latency tasks where the accuracy of results is essential. Wallaroo takes care of mechanics of scaling, resilience, state management, and message delivery. We’ve designed Wallaroo to make it easy to scale applications with no code changes, and allow programmers to focus on business logic. If you are interested in learning more about Wallaroo, I suggest you start with our introductory blog post “Hello Wallaroo!” blog post that we released back in March.

I’ve done a 15-minute video of our engineering presentation that has helped people understand what Wallaroo is. If you watch it, you will get:

  • An overview of the problem we are solving with our Scale-Independent API
  • A short intro to the Python API
  • A demonstration of our Autoscale functionality (for stateful applications)
  • To see the power of Scale-Independent APIs in action

If you want to dive in right now, head over to our website and get started. Otherwise, keep reading. We have plenty more to share.

What’s the vision?

Writing data processing tools is hard. Too hard. We require too much of our engineers. The tools we can use to quickly build code on our laptops don’t work well in a production environment. And our production tools aren’t ideal for fast, quick iteration. Wallaroo aims to change this equation.

When we set out to build Wallaroo, we wanted to improve the state of the art for event-by-event data processing by providing better per-worker throughput, dramatically lower latencies, simpler state management, and an easier operational experience. That’s where our vision started. Over the course of time, we’ve evolved our vision.

While talking to potential clients and working with partners, we’ve realized that the operational and development burdens of simultaneously supporting both a high-speed, event-by-event data processing system and a higher-latency long-running job system are too high. Asking clients to install an event-by-event system next to a long-running job system was asking them to take on too much overhead. Wallaroo has to be able to do both. If we want to meet our goal of vastly simplifying building and maintaining data processing systems, we need to provide a system that supports both event-by-event and long-running workloads. As we go forward building Wallaroo, we do so with an expanded vision.

As our CEO Vid Jain puts it:

Wallaroo should provide game-changing simplicity - data scientists and developers need to be able to go from laptop to production at any scale without changing code. Wallaroo should speed time-to-market and significantly lowers costs for applications such as capturing and transforming real-time data, performing long-running analysis and any machine learning application.

And that’s what we are looking at every day. Our engineers are always asking themselves, does this feature:

  • Make it easier to scale an application?
  • Push the burden of scaling a distributed application from the developer to the framework?
  • Improve performance?
  • Increase a developer’s productivity?
  • Reduce time-to-market?

Part of that means that we want to allow developers to use the languages they are used to. The big data landscape is dominated by projects that require you to use the JVM. The JVM is an impressive piece of technology, but it’s not for everyone. To that end, we are launching with a Python API, followed by C++ and Go bindings in the near future. We think that data scientists shouldn’t have to rewrite the application they developed in Python to get it into production. The same would apply to C++ and Go; everyone deserves great tools. We’re here to provide them to more folks.

So, that’s what we are building. But, what’s the state of Wallaroo now and where is it going in the immediate future?

What’s the current state?

Wallaroo has a solid core in place that can be immediately useful for some production workflows now. We do extensive testing of Wallaroo that we continue to expand on and improve. Through both internal testing usage and via customer proof of concept engagements, Wallaroo has already processed billions of messages in a single day.

With our open source release you get:

  • A Python 2.7 API for building linear data processing applications
  • Documentation to get you started
  • Integrated state-management
  • Process failure recovery
  • Ability to take your application from running on one process to many without changing code
  • Metrics UI

Wallaroo has been used to build a variety of applications including:

  • High-volume position keeping system (using our C++ API, slated for GA in the near future)
  • Python video transcription and analysis system using TensorFlow and NLP

We’re looking to work with commercial partners and the open source community to grow the product in line with our vision. We’ve come a long way from where we started eighteen months ago, and we know there’s plenty more to do; software is never done. The problems Wallaroo aims to solve will continue to grow and change. So what are we planning on doing with Wallaroo over the next few months?

What’s coming in the immediate future?

Knowing that we have a solid foundation in place, we have some items we are looking to address by the end of the year:

  • Improve the installation process
  • Support long-running and Micro-batch workloads
  • Add language bindings, including Go and Python 3
  • Make Autoscaling and Exactly-once message processing generally available
  • Handle increasingly esoteric failure scenarios

If you are interested in more details, check out our roadmap.


Wallaroo is an open source project. All of the source code is available to you. The code base is available under the Apache License, version 2. In earlier version of Wallaroo some parts were licensed under the Wallaroo Community License Agreement, but the Apache 2.0 license now covers all of the code.

Give Wallaroo a try

We’re excited to start working with our friends in the open source community and new commercial partners.

If you are interested in getting started with Wallaroo, head over to our website and get started. If you would like a demo or to talk about how Wallaroo can help your business, please get in touch by emailing hello@wallaroolabs.com.

There’s lots more coming from us. Expect posts from us on:

  • Testing Wallaroo for correctness
  • A look inside our Python engine
  • How exactly-once message processing works in Wallaroo
  • Scale-independent computing

See you soon!

In case you want more… right now…

An introduction to Wallaroo.

A look inside Wallaroo’s excellent performance

The company behind Wallaroo.

Wallaroo documentation.

Our VP of Engineering Sean T. Allen talks about one of the techniques we use to test Wallaroo.

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