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Faust Downloads

For reliability we use a Kafka topic as “write-ahead-log”. Whenever a key is changed we publish to the changelog. Standby nodes consume from this changelog to keep an exact replica of the data and enables instant recovery should any of the nodes fail.

faust 1.10.4

It is used at Robinhood to build high performance distributed systems and real-time data pipelines that process billions of events every day.

Faust provides both stream processing and event processing, sharing similarity with tools such as Kafka Streams, Apache Spark/Storm/Samza/Flink,

It does not use a DSL, it’s just Python! This means you can use all your favorite Python libraries when stream processing: NumPy, PyTorch, Pandas, NLTK, Django, Flask, SQLAlchemy, ++

Faust requires Python 3.6 or later for the new async/await syntax, and variable type annotations.

Here’s an example processing a stream of incoming orders:

    The Agent decorator defines a “stream processor” that essentially consumes from a Kafka topic and does something for every event it receives.

The agent is an async def function, so can also perform other operations asynchronously, such as web requests.

This system can persist state, acting like a database. Tables are named distributed key/value stores you can use as regular Python dictionaries.

Tables are stored locally on each machine using a super fast embedded database written in C++, called RocksDB.

Tables can also store aggregate counts that are optionally “windowed” so you can keep track of “number of clicks from the last day,” or “number of clicks in the last hour.” for example. Like Kafka Streams, we support tumbling, hopping and sliding windows of time, and old windows can be expired to stop data from filling up.

For reliability we use a Kafka topic as “write-ahead-log”. Whenever a key is changed we publish to the changelog. Standby nodes consume from this changelog to keep an exact replica of the data and enables instant recovery should any of the nodes fail.

To the user a table is just a dictionary, but data is persisted between restarts and replicated across nodes so on failover other nodes can take over automatically.

You can count page views by URL:

   The data sent to the Kafka topic is partitioned, which means the clicks will be sharded by URL in such a way that every count for the same URL will be delivered to the same Faust worker instance.

Faust supports any type of stream data: bytes, Unicode and serialized structures, but also comes with “Models” that use modern Python syntax to describe how keys and values in streams are serialized:

   Faust is statically typed, using the mypy type checker, so you can take advantage of static types when writing applications.

The Faust source code is small, well organized, and serves as a good resource for learning the implementation of Kafka Streams.

Learn more about Faust in the introduction introduction page

to read more about Faust, system requirements, installation instructions, community resources, and more.

or go directly to the quickstart tutorial

to see Faust in action by programming a streaming application.

then explore the User Guide

for in-depth information organized by topic.

Faust is…

Simple

Faust is extremely easy to use. To get started using other stream processing solutions you have complicated hello-world projects, and infrastructure requirements. Faust only requires Kafka, the rest is just Python, so If you know Python you can already use Faust to do stream processing, and it can integrate with just about anything.

Here’s one of the easier applications you can make:

import faust class Greeting(faust.Record): from_name: str to_name: str app = faust.App('hello-app', broker='kafka://localhost') topic = app.topic('hello-topic', value_type=Greeting) @app.agent(topic) async def hello(greetings): async for greeting in greetings: print(f'Hello from to ') @app.timer(interval=1.0) async def example_sender(app): await hello.send( value=Greeting(from_name='Faust', to_name='you'), ) if __name__ == '__main__': app.main()

You’re probably a bit intimidated by the async and await keywords, but you don’t have to know how asyncio works to use Faust: just mimic the examples, and you’ll be fine.

The example application starts two tasks: one is processing a stream, the other is a background thread sending events to that stream. In a real-life application, your system will publish events to Kafka topics that your processors can consume from, and the background thread is only needed to feed data into our example.

Highly Available

Faust is highly available and can survive network problems and server crashes. In the case of node failure, it can automatically recover, and tables have standby nodes that will take over.

Distributed

Start more instances of your application as needed.

Fast

A single-core Faust worker instance can already process tens of thousands of events every second, and we are reasonably confident that throughput will increase once we can support a more optimized Kafka client.

Flexible

Faust is just Python, and a stream is an infinite asynchronous iterator. If you know how to use Python, you already know how to use Faust, and it works with your favorite Python libraries like Django, Flask, SQLAlchemy, NTLK, NumPy, SciPy, TensorFlow, etc.

Installation

You can install Faust either via the Python Package Index (PyPI) or from source.

To install using pip :

 pip install -U faust

Bundles

Faust also defines a group of setuptools extensions that can be used to install Faust and the dependencies for a given feature.

You can specify these in your requirements or on the pip command-line by using brackets. Separate multiple bundles using the comma:

 pip install  pip install The following bundles are available:
Stores

faust[rocksdb] :

for using RocksDB for storing Faust table state.

Recommended in production.

Caching

faust[redis] :

for using Redis_ as a simple caching backend (Memcached-style).

Codecs

for using YAML and the PyYAML library in streams.

Optimization

for installing all the available C speedup extensions to Faust core.

Sensors

faust[datadog] :

for using the Datadog Faust monitor.

for using the Statsd Faust monitor.

Event Loops

faust[uvloop] :

for using Faust with uvloop .

for using Faust with eventlet

Debugging

faust[debug] :

for using aiomonitor to connect and debug a running Faust worker.

when the setproctitle module is installed the Faust worker will use it to set a nicer process name in ps / top listings. Also installed with the fast and debug bundles.

Downloading and installing from source

Download the latest version of Faust from http://pypi.org/project/faust

You can install it by doing:

 tar xvfz faust-0.0.0.tar.gz

The last command must be executed as a privileged user if you are not currently using a virtualenv.

Using the development version

You can install the latest snapshot of Faust using the following pip command:

pip install https://github.com/robinhood/faust/zipball/master#egg

FAQ

Can I use Faust with Django/Flask/etc.?

Yes! Use eventlet as a bridge to integrate with asyncio .

Using eventlet

This approach works with any blocking Python library that can work with eventlet .

Using eventlet requires you to install the aioeventlet module, and you can install this as a bundle along with Faust:

 pip install -U faustThen to actually use eventlet as the event loop you have to either use the -L argument to the faust program:
 faust -L eventlet -A myproj worker -l info

or add import mode.loop.eventlet at the top of your entry point script:

It’s very important this is at the very top of the module, and that it executes before you import libraries.

Can I use Faust with Tornado?

Can I use Faust with Twisted?

Will you support Python 2.7 or Python 3.5?

No. Faust requires Python 3.6 or later, since it heavily uses features that were introduced in Python 3.6 ( async , await , variable type annotations).

I get a maximum number of open files exceeded error by RocksDB when running a Faust app locally. How can I fix this?

You may need to increase the limit for the maximum number of open files. The following post explains how to do so on OS X: https://blog.dekstroza.io/ulimit-shenanigans-on-osx-el-capitan/

What kafka versions faust supports?

Faust supports kafka with version >= 0.10.

Getting Help

For discussions about the usage, development, and future of Faust, please join the fauststream Slack.

  • https://fauststream.slack.com
  • Sign-up: https://join.slack.com/t/fauststream/shared_invite/enQtNDEzMTIyMTUyNzU2LTIyMjNjY2M2YzA2OWFhMDlmMzVkODk3YTBlYThlYmZiNTUwZDJlYWZiZTdkN2Q4ZGU4NWM4YWMyNTM5MGQ5OTg

Resources

If you have any suggestions, bug reports, or annoyances please report them to our issue tracker at https://github.com/robinhood/faust/issues/

License

This software is licensed under the New BSD License . See the LICENSE file in the top distribution directory for the full license text.

Contributing

Development of Faust happens at GitHub: https://github.com/robinhood/faust

You’re highly encouraged to participate in the development of Faust .

Be sure to also read the Contributing to Faust section in the documentation.

Code of Conduct

Everyone interacting in the project’s code bases, issue trackers, chat rooms, and mailing lists is expected to follow the Faust Code of Conduct.

As contributors and maintainers of these projects, and in the interest of fostering an open and welcoming community, we pledge to respect all people who contribute through reporting issues, posting feature requests, updating documentation, submitting pull requests or patches, and other activities.

We are committed to making participation in these projects a harassment-free experience for everyone, regardless of level of experience, gender, gender identity and expression, sexual orientation, disability, personal appearance, body size, race, ethnicity, age, religion, or nationality.

Examples of unacceptable behavior by participants include:

  • The use of sexualized language or imagery
  • Personal attacks
  • Trolling or insulting/derogatory comments
  • Public or private harassment
  • Publishing other’s private information, such as physical or electronic addresses, without explicit permission
  • Other unethical or unprofessional conduct.

Project maintainers have the right and responsibility to remove, edit, or reject comments, commits, code, wiki edits, issues, and other contributions that are not aligned to this Code of Conduct. By adopting this Code of Conduct, project maintainers commit themselves to fairly and consistently applying these principles to every aspect of managing this project. Project maintainers who do not follow or enforce the Code of Conduct may be permanently removed from the project team.

This code of conduct applies both within project spaces and in public spaces when an individual is representing the project or its community.

Instances of abusive, harassing, or otherwise unacceptable behavior may be reported by opening an issue or contacting one or more of the project maintainers.

Faust Downloads

Faust comes in many different forms and it can be confusing to know what to install to start using this tool. We recommend you to have a look at the overview of the Faust universe section of the Faust manual. That being said, most of the features of Faust are accessible through the

so we recommend most people to use this tools which doesn't require any installation. Now, if you really wish to have a local version of Faust on your system, this page should give you an overview of the options that you have.

Faust Compiler & libfaust

Windows

  • Look for the most recent Faust-XXX-win64.exe on: https://github.com/grame-cncm/faust/releases

MacOS

  • Look for the most recent Faust-XXX.dmg on: https://github.com/grame-cncm/faust/releases or use MacPorts or Homebrew package managers

Linux

  • Look for the most recent Faust-XXX.tar.gz on: https://github.com/grame-cncm/faust/releases or use your favorite package installer depending of your distribution

Building Faust from the Source

Alternatively, you might want to build Faust from scratch. For that you can either get the latest release of the Faust source or clone it from our GitRepo. Build instructions are available here.

FaustLive

FaustLive is an "on-the-fly" compiler for Faust (see the overview of the Faust universe for more information) allowing us to instantly run Faust programs.

Windows

  • Look for the most recent FaustLive-XXX-win64.exe on: https://github.com/grame-cncm/faustlive/releases

MacOS

  • Look for the most recent FaustLive-XXX.dmg on: https://github.com/grame-cncm/faustlive/releases

Linux

  • Look for the most recent FaustLive-XXX.tar.gz on: https://github.com/grame-cncm/faustlive/releases

Building FaustLive from the Source

Alternatively, you might want to build FaustLive from scratch. For that you can either get the latest release of the FaustLive source or clone it from our GitRepo.

Faustgen

Faustgen is a Max/MSP object to compile Faust code dynamically (see the overview of the Faust universe for more information).

Windows

  • Look for the most recent faustgen-XXX-win64.zip on: https://github.com/grame-cncm/faust/releases

MacOS

  • Look for the most recent faustgen-XXX-macosx.dmg on: https://github.com/grame-cncm/faust/releases

FaustWorks

FaustWorks is an IDE for the Faust compiler. It is not actively maintained and you should use Faust WEB IDE instead. The source code is available from the FaustWorks github repository

Search

From here you can search these documents. Enter your search terms below.

The Headless WordPress Framework

Faust is a JavaScript framework designed to make the development of headless WordPress sites as easy as possible for WordPress and JavaScript developers. The mission of Faust is to reduce the complexity of building headless WordPress frontends for the web, allowing the developer to build production sites with the ease of a monolithic WordPress site.

License: MIT GitHub

Why Faust.js?

Faust.js is the first choice for companies that build Headless WordPress sites

Gutenberg Blocks Support

Get started with using Gutenberg Blocks Provider and Viewer in Faust.

Apollo

Flexibly perform declarative queries to manipulate and structure data using Apollo.

Previews

Preview posts and pages before publishing and rewrite WordPress preview URLs to your frontend.

WP Template Hierarchy

Use chained requests, resolve custom post type templates, and more.

Plugin System

Faust has a robust, built-in, plugin system that allows practically every part of the framework to be configurable.

Next.js

Build a static site with WordPress data outside the template hierarchy with Next.js file based pages.

Migration Guide from GQty

Follow this guide to migrate from old Faust.js (GQty) to new Faust (Apollo).

Learn Faust.js

Get up and running with Faust.js quickly by downloading our example

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