LDAP: disable the cleanup task by default

Resolves:
    https://fedorahosted.org/sssd/ticket/2627

The cleanup task was designed to keep the cache size within certain
limits. This is how it roughly works now:
    - find users who have never logged in by default. If
      account_cache_expiration is set, find users who loggged in later
      than account_cache_expiration
    - delete the matching set of users
    - find groups that have no members
    - delete the matching set of groups

So unless account_cache_expiration is set to something sensible, only empty
groups and expired users who never logged in are removed and that's quite
a corner case. The above effectivelly walks the whole database, especially
the groups step is quite slow with a huge database. The whole cleanup task
also runs in a single sysdb transaction, which means all other transactions
are blocked while the cleanup task crunches the database.

Reviewed-by: Lukáš Slebodník <lslebodn@redhat.com>

0 files changed, 0 insertions, 0 deletions