[Bug 1802487] [NEW] Fix performance regression in v1.57

[Ricardo]

Public bug reported:

Just migrated a python 2 application from 14.04 LTS to 18.04 LTS and got
a serious performance degradation. Like 1000 times slower. After some
profiling it was concluded that the problem was the transition from
cPickle back to pickle for data serialization.

This is a problem fixed in version 1.58.
https://github.com/linsomniac/python-memcached/releases/tag/1.58

Please upgrade python-memcache to a more recent version or patch the
current version.

Versions affected: Ubuntu 16.04 LTS and Ubuntu 18.04 LTS

** Affects: python-memcache (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1802487

Title:
  Fix performance regression in v1.57

Status in python-memcache package in Ubuntu:
  New

Bug description:
  Just migrated a python 2 application from 14.04 LTS to 18.04 LTS and
  got a serious performance degradation. Like 1000 times slower. After
  some profiling it was concluded that the problem was the transition
  from cPickle back to pickle for data serialization.

  This is a problem fixed in version 1.58.
  https://github.com/linsomniac/python-memcached/releases/tag/1.58

  Please upgrade python-memcache to a more recent version or patch the
  current version.

  Versions affected: Ubuntu 16.04 LTS and Ubuntu 18.04 LTS

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