[Bug 1802487] Update Released

[Brian Murray]

The verification of the Stable Release Update for python-memcache has
completed successfully and the package has now been released to
-updates.  Subsequently, the Ubuntu Stable Release Updates Team is being
unsubscribed and will not receive messages about this bug report.  In
the event that you encounter a regression using the package from
-updates please report a new bug using ubuntu-bug and tag the bug report
regression-update so we can easily find any regressions.

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

Title:
  Fix performance regression in v1.57

Status in python-memcache package in Ubuntu:
  Fix Released
Status in python-memcache source package in Bionic:
  Fix Committed
Status in python-memcache source package in Cosmic:
  Fix Committed
Status in python-memcache source package in Disco:
  Fix Released

Bug description:
  [Impact]
  Performance under Python 2 with this package since 1.54 is poor due to the lack of use of the native C implementation of pickle.

  [Test Case]
  run attached memcache-test.py under python 2.
  with proposed fixes, should be approximately 2/3 of the execution time of the unpatched version.

  [Regression Potential]
  The picked fix is relatively minor and simply adjusts the import under Py2 to use the native C implementation so regression potential will be low.

  [Original Bug Report]
  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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