python tests broken (Re: s4:samldb LDB module - "member" trigger)
Stefan (metze) Metzmacher
metze at samba.org
Thu Nov 4 03:20:00 MDT 2010
> I like your patch - please merge it!
What do you think about this one?
> Stefan (metze) Metzmacher wrote:
>>> Metze mentioned this patch to me on IRC as he chases down some
>>> performance issues, and I wanted to comment on it. He may make further
>>> comments once he finishes pinning down his issue.
>>> The problem I have with the patch is that it seems very inefficient, and
>>> I wondered if you had considered the O() notation complexity of this
>>> For every member being added, you now do a search on the entry for that
>>> member, rather than just let ldb_tdb complain about the duplicate
>>> attribute when we eventually store it. Why is this? If an member
>>> attribute gains 100 members, you now do 100 searches of the DB just to
>>> check that they are not already there. The cost of that search is
>>> rougly proportional to the number of members already being added -
>>> particularly if done one at at a time, so this seems to be O(n^2).
>>> And similarly, whey trying to determine if the member attribute would
>>> conflict with a primaryGroupID, why not first (and only once) read the
>>> sid of the entry, and then compare with the primaryGroupID of the
>>> Surely this would be faster than dereferencing the member attribute,
>>> only to form up a SID and compare it with our own DN?
>> I fixed the problem, but I can't verify my changes with make test.
>> I discovered that 21 of 30 python tests are broken, currently!
>> The piping through filter-subunit just ignores the errors...
>> This patch add the logic to let us notice the errors again.
>> Most tests fail with:
>> [25/30 in 1m46s, 18 errors] samba4.ldap.acl.python(fl2008r2dc)
>> Traceback (most recent call last):
>> line 12, in<module>
>> samba.ensure_external_module("subunit", "subunit/python")
>> line 319, in ensure_external_module
>> line 128, in<module>
>> from testtools import content, content_type,
>> ImportError: No module named testtools
>> Jelmer can please take a look at this and fix it?
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