[Bug 1582585] Re: the speed of query user from ldap server is very slow

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** Tags added: patch

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Title:
  the speed of query user from ldap server is very slow

Status in Ubuntu Cloud Archive:
  New
Status in Ubuntu Cloud Archive mitaka series:
  Triaged
Status in Ubuntu Cloud Archive newton series:
  Triaged
Status in OpenStack Identity (keystone):
  Fix Released
Status in keystone package in Ubuntu:
  New
Status in keystone source package in Xenial:
  Triaged

Bug description:
  In our project, the speed of query user from ldap server is very
  slow,our ldap user number is 12,000,the query costs almost 45 seconds

  The reason is that keystone will generate the uuid for the ldap users one by one and insert db.And second query time later,it also goes to db,not use the cache.
  So adding the cache to improve the query speed

  After adding @MEMOIZE to the following function
  https://github.com/openstack/keystone/blob/master/keystone/identity/core.py#L580.
  First query time almost costs 50 seconds,but second query time later it only costs 7 seconds.

  So it is very necessary to improve this feature

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