Apache Airflow - A platform to programmatically author, schedule, and monitor workflows
Apache Airflow (or simply Airflow) is a platform to programmatically author, schedule, and monitor workflows.
When workflows are defined as code, they become more maintainable, versionable, testable, and collaborative.
Use Airflow to author workflows as directed acyclic graphs (DAGs) of tasks. The Airflow scheduler executes your tasks on an array of workers while following the specified dependencies. Rich command line utilities make performing complex surgeries on DAGs a snap. The rich user interface makes it easy to visualize pipelines running in production, monitor progress, and troubleshoot issues when needed.
Table of contents
- Project Focus
- Getting started
- Installing from PyPI
- Official source code
- Convenience packages
- User Interface
- Who uses Apache Airflow?
- Who Maintains Apache Airflow?
- Can I use the Apache Airflow logo in my presentation?
- Airflow merchandise
Airflow works best with workflows that are mostly static and slowly changing. When DAG structure is similar from one run to the next, it allows for clarity around unit of work and continuity. Other similar projects include Luigi, Oozie and Azkaban.
Airflow is commonly used to process data, but has the opinion that tasks should ideally be idempotent (i.e. results of the task will be the same, and will not create duplicated data in a destination system), and should not pass large quantities of data from one task to the next (though tasks can pass metadata using Airflow's Xcom feature). For high-volume, data-intensive tasks, a best practice is to delegate to external services that specialize on that type of work.
Airflow is not a streaming solution, but it is often used to process real-time data, pulling data off streams in batches.
- Dynamic: Airflow pipelines are configuration as code (Python), allowing for dynamic pipeline generation. This allows for writing code that instantiates pipelines dynamically.
- Extensible: Easily define your own operators, executors and extend the library so that it fits the level of abstraction that suits your environment.
- Elegant: Airflow pipelines are lean and explicit. Parameterizing your scripts is built into the core of Airflow using the powerful Jinja templating engine.
- Scalable: Airflow has a modular architecture and uses a message queue to orchestrate an arbitrary number of workers.
Apache Airflow is tested with:
| | Master version (2.0.0dev) | Stable version (1.10.12) || ------------ | ------------------------- | ------------------------ || Python | 3.6, 3.7, 3.8 | 2.7, 3.5, 3.6, 3.7, 3.8 || PostgreSQL | 9.6, 10, 11, 12, 13 | 9.6, 10, 11, 12, 13 || MySQL | 5.7, 8 | 5.6, 5.7 || SQLite | latest stable | latest stable || Kubernetes | 1.16.2, 1.17.0 | 1.16.2, 1.17.0 |
Note: MariaDB and MySQL 5.x will work fine for a single scheduler, but don't work or have limitationsrunning more than a single scheduler -- please see the "Scheduler" docs.
Note: SQLite is used primarily for development purpose.
Additional notes on Python version requirements
- Stable version requires at least Python 3.5.3 when using Python 3
Note: If you're looking for documentation for master branch (latest development branch): you can find it on ReadTheDocs.
For more information on Airflow's Roadmap or Airflow Improvement Proposals (AIPs), visit the Airflow Wiki.
Official Docker (container) images for Apache Airflow are described in IMAGES.rst.
Installing from PyPI
We publish Apache Airflow as
apache-airflow package in PyPI. Installing it however might be sometimes trickybecause Airflow is a bit of both a library and application. Libraries usually keep their dependencies open andapplications usually pin them, but we should do neither and both at the same time. We decided to keepour dependencies as open as possible (in
setup.py) so users can install different versions of librariesif needed. This means that from time to time plain
pip install apache-airflow will not work or willproduce unusable Airflow installation.
In order to have repeatable installation, however, introduced in Airflow 1.10.10 and updated inAirflow 1.10.12 we also keep a set of "known-to-be-working" constraint files in theorphan
constraints-1-10 branches. We keep those "known-to-be-working"constraints files separately per major/minor python version.You can use them as constraint files when installing Airflow from PyPI. Note that you have to specifycorrect Airflow tag/version/branch and python versions in the URL.
- Installing just Airflow:
bashpip install apache-airflow==1.10.12 \ --constraint "https://raw.githubusercontent.com/apache/airflow/constraints-1.10.12/constraints-3.7.txt"
- Installing with extras (for example postgres,google)
bashpip install apache-airflow[postgres,google]==1.10.12 \ --constraint "https://raw.githubusercontent.com/apache/airflow/constraints-1.10.12/constraints-3.7.txt"
For information on installing backport providers check https://airflow.readthedocs.io/en/latest/backport-providers.html.
Official source code
Apache Airflow is an Apache Software Foundation (ASF) project,and our official source code releases:
- Follow the ASF Release Policy
- Can be downloaded from the ASF Distribution Directory
- Are cryptographically signed by the release manager
- Are officially voted on by the PMC members during theRelease Approval Process
Following the ASF rules, the source packages released must be sufficient for a user to build and test therelease provided they have access to the appropriate platform and tools.
There are other ways of installing and using Airflow. Those are "convenience" methods - they arenot "official releases" as stated by the
ASF Release Policy, but they can be used by the userswho do not want to build the software themselves.
Those are - in the order of most common ways people install Airflow:
- PyPI releases to install Airflow using standard
- Docker Images to install airflow via
dockertool, use them in Kubernetes, Helm Charts,
docker swarmetc. You canread more about using, customising, and extending the images in theLatest docs, andlearn details on the internals in the IMAGES.rst document.
- Tags in GitHub to retrieve the git project sources thatwere used to generate official source packages via git
All those artifacts are not official releases, but they are prepared using officially released sources.Some of those artifacts are "development" or "pre-release" ones, and they are clearly marked as suchfollowing the ASF Policy.
DAGs: Overview of all DAGs in your environment.
Tree View: Tree representation of a DAG that spans across time.
Graph View: Visualization of a DAG's dependencies and their current status for a specific run.
Task Duration: Total time spent on different tasks over time.
Gantt View: Duration and overlap of a DAG.
Code View: Quick way to view source code of a DAG.
Want to help build Apache Airflow? Check out our contributing documentation.
Who uses Apache Airflow?
More than 350 organizations are using Apache Airflow in the wild.
Who Maintains Apache Airflow?
Airflow is the work of the community,but the core committers/maintainersare responsible for reviewing and merging PRs as well as steering conversation around new feature requests.If you would like to become a maintainer, please review the Apache Airflowcommitter requirements.
Can I use the Apache Airflow logo in my presentation?
If you would love to have Apache Airflow stickers, t-shirt etc. then check outRedbubble Shop.
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