0f4c0e92b2
This PR was squashed before being merged into the 4.1-dev branch (closes #26096).
Discussion
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[HttpFoundation] Added a migrating session handler
| Q | A
| ------------- | ---
| Branch? | master
| Bug fix? | no
| New feature? | yes
| BC breaks? | no
| Deprecations? | no
| Tests pass? | yes
| Fixed tickets |
| License | MIT
| Doc PR | https://github.com/symfony/symfony-docs/pull/9496
- [x] gather feedback for my changes
- [x] submit changes to the documentation
- [x] update the changelog
When migrating to a new session handler on a live system, it's useful to be able to do it with no loss of session data. This migrating handler allows the sessions to be written to an additional handler to enable a migration workflow like:
* Switch to migrating handler, with your new handler as the 'write only' one. The old handler behaves as usual and sessions get written to the new one.
* After verifying the data in the new handler (and after the session gc period), switch the migrating handler to use your old handler as the 'write only' one instead, so the sessions will now be read from the new handler. This step allows easier rollbacks.
* After verifying everything, switch from the migrating handler to the new handler
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