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
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.
Apache Airflow is tested with:
| Master version (2.1.0dev) | Stable version (1.10.15) | |
|---|---|---|
| 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 | 1.16.9, 1.17.5, 1.18.6 | 1.16.9, 1.17.5, 1.18.6 |
Note: MariaDB and MySQL 5.x are unable to or have limitations with running multiple schedulers -- please see the "Scheduler" docs.
Note: SQLite is used in Airflow tests. Do not use it in production.
Visit the official Airflow website documentation (latest stable release) for help with installing Airflow, getting started, or walking through a more complete tutorial.
Note: If you're looking for documentation for master branch (latest development branch): you can find it on s.apache.org/airflow-docs.
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.
We publish Apache Airflow as apache-airflow package in PyPI. Installing it however might be sometimes tricky
because Airflow is a bit of both a library and application. Libraries usually keep their dependencies open and
applications usually pin them, but we should do neither and both at the same time. We decided to keep
our dependencies as open as possible (in setup.py) so users can install different versions of libraries
if needed. This means that from time to time plain pip install apache-airflow will not work or will
produce unusable Airflow installation.
In order to have repeatable installation, however, introduced in Airflow 1.10.10 and updated in
Airflow 1.10.12 we also keep a set of "known-to-be-working" constraint files in the
orphan constraints-master and 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 specify
correct Airflow tag/version/branch and python versions in the URL.
NOTE!!!
On November 2020, new version of PIP (20.3) has been released with a new, 2020 resolver. This resolver
does not yet work with Apache Airflow and might leads to errors in installation - depends on your choice
of extras. In order to install Airflow you need to either downgrade pip to version 20.2.4
pip upgrade --pip==20.2.4 or, in case you use Pip 20.3, you need to add option
--use-deprecated legacy-resolver to your pip install command.
pip install apache-airflow==1.10.15 \
--constraint "https://raw.githubusercontent.com/apache/airflow/constraints-1.10.15/constraints-3.7.txt"
NOTE!!!
On 30th of November 2020, new version of PIP (20.3) has been released with a new, 2020 resolver.
This resolver does not yet work with Apache Airflow and might leads to errors in installation -
depends on your choice of extras. In order to install Airflow you need to either downgrade
pip to version 20.2.4 pip upgrade --pip==20.2.4 or, in case you use Pip 20.3, you need to add option
--use-deprecated legacy-resolver to your pip install command.
pip install apache-airflow[postgres,google]==1.10.15 \
--constraint "https://raw.githubusercontent.com/apache/airflow/constraints-1.10.15/constraints-3.7.txt"
For information on installing backport providers check [/docs/backport-providers.rst][/docs/backport-providers.rst].
Apache Airflow is an Apache Software Foundation (ASF) project, and our official source code releases:
Following the ASF rules, the source packages released must be sufficient for a user to build and test the release provided they have access to the appropriate platform and tools.
There are other ways of installing and using Airflow. Those are "convenience" methods - they are
not "official releases" as stated by the ASF Release Policy, but they can be used by the users
who do not want to build the software themselves.
Those are - in the order of most common ways people install Airflow:
pip tooldocker tool, use them in Kubernetes, Helm Charts, docker-compose, docker swarm etc. You can
read more about using, customising, and extending the images in the
Latest docs, and
learn details on the internals in the IMAGES.rst document.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 such following 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.
More than 350 organizations are using Apache Airflow in the wild.
Airflow is the work of the community, but the core committers/maintainers are 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 Airflow committer requirements.
Yes! Be sure to abide by the Apache Foundation trademark policies and the Apache Airflow Brandbook. The most up to date logos are found in this repo and on the Apache Software Foundation website.
If you would love to have Apache Airflow stickers, t-shirt etc. then check out Redbubble Shop.
FAQs
Programmatically author, schedule and monitor data pipelines
We found that apache-airflow-zack demonstrated a healthy version release cadence and project activity because the last version was released less than a year ago. It has 1 open source maintainer collaborating on the project.
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