Opened 3 years ago

Closed 3 years ago

#18302 closed Bug (invalid)

1.4 cache session storage is not backward compatible

Reported by: slymsg@… Owned by: nobody
Component: Documentation Version: 1.4
Severity: Normal Keywords:
Cc: Triage Stage: Unreviewed
Has patch: no Needs documentation: no
Needs tests: no Patch needs improvement: no
Easy pickings: no UI/UX: no


I just updated from 1.3 to 1.4 using
and my sessions were lost.

Apparently the cache backend in 1.4 uses an
extra prefix to store the session_key in the cache:

KEY_PREFIX = "django.contrib.sessions.cache"

Since this prefix cannot be configured from the
settings, I had to create a new cache session backend
based on the 1.4 version, setting KEY_PREFIX to "".

I cannot find anything about this change in the
changelogs. Did I miss something?

Change History (1)

comment:1 Changed 3 years ago by lukeplant

  • Needs documentation unset
  • Needs tests unset
  • Patch needs improvement unset
  • Resolution set to invalid
  • Status changed from new to closed

It was a change in 1.3.1 -

According to those notes, we didn't consider it backwards incompatible since sessions are meant to be transient. In addition, you shouldn't have been upgrading from 1.3 to 1.4 - you should have been using 1.3.1 as soon as it was released since it was a security release.

For those reasons I'm going to mark INVALID.

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