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The purpose of this document is to capture all the key elements which need to be done in order to release Airflow 2.0 to the world.

Functional scope: 

We are working to establish the scope of Airflow 2.0 so that it can be worked towards and released. The main functional elements which have been referenced and talked about by the Airflow PMC in various presentation as being components of Airflow 2.0 are listed below. The current scope as a result of the planning meetings in terms of big functional elements is:

  1. Scheduler HA - Improve Scheduler performance and reliability (AIP-15)
  2. Airflow REST API (AIP-32)
  3. Functional DAGs (AIP-31)
  4. Production-ready Docker Image and Helm Chart (AIP-26)
  5. Providers Package (AIP-21)
  6. Simplified Kubernetes Executor and KubePodOperator
  7. Smart Sensor PR (AIP-17) as an "early access" feature. 

The following functional elements were discussed and deferred to a later (post 2.0) release:

  • DAG Versioning
  • Schedule Interval / Execution at Start of Schedule or End of Schedule

Next steps

The immediate action items with respect to scope are:

  1. Finish the post-discussion action items on the Providers Packages. 
  2. Discuss progress and details on API and Improvements to SubDags (AIP-34)


The major upcoming milestones are:

DateMilestone
Week of 7 Sep 2020Create the 2.0.0-test branch

While the scope is fluid, we would be rebasing this test branch from master. After we completely freeze the scope, we would only cherrypick commits from Airflow Master to v2-0-test branch if they are “in-scope”. Normal development would continue on Master branch i.e. PRs would be created against Airflow Master.

Week of 28 Sep 2020Cut Functionally complete 2.0 alpha release
Week of 12 Oct 2020Cut first 2.0 beta release

Beta snapshots would be published to the Airflow Community to test and create issues to make sure Airflow is functioning and backwards compatible. 

Week of 19 Oct 2020Cut bridge release based on 1.10.x - jump-off point to 2.0. Probably 1.10.13 or 1.10.14 containing upgrade check scripts for 2.0
Week of 26 Oct 2020Cut second 2.0 beta release
Week of 9 Nov 2020Cut third 2.0 beta release
Week of 23 Nov 2020Cut first 2.0 release candidate (2.0.0rc1)

As part of creating the release candidate, an official vote would be started to release 2.0.0. If there are any bugs discovered in 2.0.0rc1, they will be fixed and a new release candidate will be published.  This will be repeated until the Vote passes

Approach

In the interest of clarity, the core approach is detailed below:

  1. Semantic versioning
    Since Airflow has adopted Semantic versioning, this is the opportunity to make significant changes to Airflow, including deprecating functionality and breaking changes. 

  2. Deprecate, don’t break 
    However, the key principle should be to deprecate functionality but not to break existing functionality. 

  3. Backwards compatibility 
    As far as possible, this release should be backwards compatible. If it is not possible to be backwards compatible, this should be flagged and ideally automatically migrated through a utility (which could be an add-on). 


Non-functional scope: 

We also need to establish the non-functional elements needed for a “major release” such as this. These include:

  1. Capturing changes which are needed:
    • Schedule (Setting to add choice of schedule at end or schedule at start of interval)
    • Connections (making in unique)
    • Changes to be made to the configuration file
    • Changes to be made to DAGs / SubDags ?
    • Changes to the installation mechanism: Providers, Plugins etc.
    • Changes to any other core concepts
  2. Migration tools:
    • “Am I ready” to migrate to Airflow 2.0?
    • Upgrade configurations, etc. from 1.xx to 2.0
  3. Manual changes to migrate / upgrade
    • Migrating from “experimental” to new API
  4. Testing
  5. Docs
    • Updating.md guide especially needs to cover what the migration script does and more comprehensive and easily readable
    • Make docs-site cleaner and more organized

Github Issues:

To track the progress of work, we use:

Dev Calls

To agree, stay aligned to the process and track the progress of Airflow 2.0 we should have regular calls between Airflow Develops (PMC Members, Committers and whoever is willing to help in Airflow 2.0).

Calendar: 


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