Sequencing the Migration
This chapter aims to give you an overview of the various timeline of the migration. From your point of view. From the life cycle of Eventlet point of view and its integration with versions of CPython. And to finish from the point of view of the migration of OpenStack.
Your Migration 🔗
The Gantt diagram below aims to give you an overview of how the removal of Eventlet from your deliverable could looks if started at 2025 March 19th.
%%{init: {'theme': 'dark', 'gantt': {'titleColor': '#ffffff', 'sectionColor': '#ffffff', 'taskColor': '#ffffff', 'taskTextColor': '#ffffff'}}}%%
gantt
title Hypothetical Eventlet Migration Plan For Your Deliverables
dateFormat YYYY-MM-DD
axisFormat %d/%m/%Y
todayMarker stroke:red
section Preparation
Locate usages :prep1, 2025-03-19, 7d
Audit code :prep2, after prep1, 14d
Check disablable :prep3, after prep2, 3d
section Alternatives
Assess app structure :choice1, after prep3, 5d
Evaluate integration :choice2, after choice1, 5d
Make decision :milestone, after choice2, 0d
section Organization
Isolate parts :org1, after choice2, 10d
Services first :org2, after org1, 3d
section Migration
Implement deprecation :mig1, after org2, 14d
Migrate executors :mig2, after mig1, 21d
Migrate monkey patching :mig3, after mig2, 28d
section Validation
Regression testing :val1, after mig3, 14d
Gradual deployment :val2, after val1, 14d
Removing requirements :val3, after val2, 2d
How Is Sequenced the Global Retirement Of Eventlet 🔗
The Gantt diagram below aims to give you an overview of the global retirement plan of Eventlet and what support and next steps you should expect.
Support of Eventlet will end by April 2027. Past this date if your migration is not finished, you will have to pin your requirements and you will have to stick to the CPython versions supported by the version of Eventlet you are using. We strongly recommend you to not pass over this date.
%%{init: {'theme': 'dark', 'gantt': {'titleColor': '#ffffff', 'sectionColor': '#ffffff', 'taskColor': '#ffffff', 'taskTextColor': '#ffffff'}}}%%
gantt
title Eventlet's Retirement Plan
dateFormat YYYY-MM-DD
axisFormat %d/%m/%Y
todayMarker stroke:red
section Preparation
Propose Eventlet's retirement :prep1, 2023-12-08, 4w
Discuss about the terms of retirement :prep2, 2024-01-01, 14d
Document the migration :prep3, after prep2, 52w
Maintenance mode :prep4, after prep2, 166w
Final retirement :prep5, after prep4, 4w
section Compatibility
Implementing Support for Python 3.12 :alt1, after prep2, 10w
Implementing Support for AsyncIO :alt2, after alt1, 20w
Implementing Support for Python 3.13 :alt3, after alt2, 15w
Implementing Support for Python 3.14 :alt4, after alt3, 45w
Remove Support for Python 3.9 :alt5, after alt4, 4w
Implementing Support for Python 3.15 :alt6, after alt5, 45w
Remove Support for Python 3.10 :alt7, after alt6, 4w
section Support
Stop supporting new features :sta1, 2024-02-01, 164w
Deprecating not AsyncIO hubs :sta2, 2025-04-01, 54w
Stop supporting not AsyncIO hubs :sta3, 2026-04-01, 51w
Stop fixing bugs :sta4, 2027-01-01, 12w
How Is Sequenced the abandon of Eventlet in OpenStack 🔗
The Gantt diagram below aims to give you an overview of the Eventlet removal plan OpenStack and what support and next steps you should expect.
%%{init: {'theme': 'dark', 'gantt': {'titleColor': '#ffffff', 'sectionColor': '#ffffff', 'taskColor': '#ffffff', 'taskTextColor': '#ffffff'}}}%%
gantt
title OpenStack's Migration Plan
dateFormat YYYY-MM-DD
axisFormat %d/%m/%Y
todayMarker stroke:red
section Migration
Discuss the Eventlet problem :prep1, 2023-11-20, 2w
Propose a community goal :prep2, after prep1, 34w
Select the community goal :prep3, after prep2, 15w
Start officially the migration :prep4, after prep3, 2w
Prepare Oslo (deprecate/ new drivers) :prep5, after prep4, 24w
Accelerate the migration of services :prep6, 2025-04-04, 52w
Remove deprecated parts of services :prep7, 2026-04-01, 27w
Cleans up Eventlet from services :prep8, 2026-10-01, 12w
Remove deprecated parts of libraries :prep9, after prep8, 12w
Drop Eventlet from requirements :prep10, after prep9, 2w
