Stuck on an issue?

Lightrun Answers was designed to reduce the constant googling that comes with debugging 3rd party libraries. It collects links to all the places you might be looking at while hunting down a tough bug.

And, if you’re still stuck at the end, we’re happy to hop on a call to see how we can help out.

pip 10: "pip list" warns "Cache entry deserialization failed, entry ignored"

See original GitHub issue

Hello, pip v.10 repeatedly warns “Cache entry deserialization failed, entry ignored”:

$ uname
Darwin
$ sw_vers
ProductName:	Mac OS X
ProductVersion:	10.13.4
BuildVersion:	17E199
$ brew info python@2
python@2: stable 2.7.14 (bottled), devel 2.7.15rc1, HEAD
Interpreted, interactive, object-oriented programming language
https://www.python.org/
/usr/local/Cellar/python@2/2.7.14_3 (4,603 files, 81.8MB) *
  Poured from bottle on 2018-03-10 at 22:25:36
 :
 :
$ brew info python3
python: stable 3.6.5 (bottled), devel 3.7.0b3, HEAD
Interpreted, interactive, object-oriented programming language
https://www.python.org/
/usr/local/Cellar/python/3.6.5 (4,768 files, 100.2MB) *
  Poured from bottle on 2018-03-30 at 20:43:21
 :
 :
$ pip2 -V
pip 10.0.0 from /usr/local/lib/python2.7/site-packages/pip (python 2.7)
$ pip3 -V
pip 10.0.0 from /usr/local/lib/python3.6/site-packages/pip (python 3.6)
$ pip2 list --outdated
Package  Version Latest      Type 
-------- ------- ----------- -----
protobuf 3.5.1   3.5.2.post1 wheel
$ pip3 list --outdated
Cache entry deserialization failed, entry ignored
Cache entry deserialization failed, entry ignored
Cache entry deserialization failed, entry ignored
Cache entry deserialization failed, entry ignored
Cache entry deserialization failed, entry ignored
Cache entry deserialization failed, entry ignored
Cache entry deserialization failed, entry ignored
Cache entry deserialization failed, entry ignored
Cache entry deserialization failed, entry ignored
Cache entry deserialization failed, entry ignored
Cache entry deserialization failed, entry ignored
Cache entry deserialization failed, entry ignored
Cache entry deserialization failed, entry ignored
Cache entry deserialization failed, entry ignored
Cache entry deserialization failed, entry ignored
Cache entry deserialization failed, entry ignored
Cache entry deserialization failed, entry ignored
Cache entry deserialization failed, entry ignored
Cache entry deserialization failed, entry ignored
Cache entry deserialization failed, entry ignored
Cache entry deserialization failed, entry ignored
Cache entry deserialization failed, entry ignored
Cache entry deserialization failed, entry ignored
Cache entry deserialization failed, entry ignored
Package  Version Latest      Type 
-------- ------- ----------- -----
protobuf 3.5.1   3.5.2.post1 wheel
$

Issue Analytics

State:
Created 5 years ago
Reactions:16
Comments:27 (12 by maintainers)

Top GitHub Comments

49reactions

pradyunsgcommented, Apr 17, 2018

It seems like you have messed up your pip cache. It’s stored in ~/.cache/pip.

If you delete that directory, this issue should be fixed.

8reactions

japagetwcommented, Apr 18, 2018

I suspect that the problem is that cache entries created in Python 2 cannot be deserialized in Python 3. If I use the --cache-dir option to force different caches for Python 2 and Python 3, the problem goes away.

The error message is generated from C:\Python36\Lib\site-packages\pip_vendor\cachecontrol\controller.py line 139. The proximate cause is a failure of Serializer.loads() in C:\Python36\Lib\site-packages\pip_vendor\cachecontrol\serialize.py line 75.

Top Results From Across the Web

Cache entry deserialization failed, entry ignored

Regarding the error/warning message in the question's title: Cache entry deserialization failed, entry ignored.

After update to pip 10 I get: Cache entry deserialization failed ...

After I updated pip2/3 to 10 from 9 I sometimes get: Cache entry deserialization failed, entry ignored. For example when I execute: pip3...

" Cache entry deserialization failed, entry ignored" on Python ...

The error message is generated by pip, I don't have control over it nor can I supress it without suppressing any errors which...

Django Cache entry deserialization failed, entry ignored

In both operations, a key identifying the data item is required. Warning pip _vendor cachecontrol controller cache entry deserialization failed entry ignored.

Bountysource

pip 10 : "pip list" warns "Cache entry deserialization failed, entry ignored"