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Description of problem:
Operations with groups which have a lot of users, e.g. 15K, are very slow in IPA management framework- both CLI and Web UI.

`ipa group-find` and `ipa group-show` calls takes a lot of resources in httpd process. The computation takes a lot of time(120s) so CLI will time out. In Web UI, when it finally receives the data, internal computations to render group members takes also a lot of time(e.g. 8s).

Version-Release number of selected component (if applicable):
3.x - 4.x (every)

How reproducible:
always

Steps to Reproduce:
1. create IPA instance with 15K+ users in ipausers group
2. call `ipa group-show ipausers`

Actual results:
Hi server load, CLI timeout.

Expected results:
CLI will print result in timely fashion.

Upstream ticket:
https://fedorahosted.org/freeipa/ticket/4947

Upstream ticket:
https://fedorahosted.org/freeipa/ticket/4965

Ticket #4948 is also related - removes member fetching in comboboxes in Web UI

master:
https://fedorahosted.org/freeipa/changeset/efcd48ad01a39a67f131a2cea9d54771642222fb

Related faster DN implementation:

master:
https://fedorahosted.org/freeipa/changeset/11bd9d96f191066f7ba760549f00179c128a9787

master:
https://fedorahosted.org/freeipa/changeset/e4930b3235e5d61d227a7e43d30a8feb7f35664d

Upstream ticket:
https://fedorahosted.org/freeipa/ticket/4995

Ticket 4947 fixed upstream
master:
https://fedorahosted.org/freeipa/changeset/4364ac08c538e3a4253804f523707092b34c2ed2

Faster Web UI:

master:
* 68f04643d6022707e8ccac9f8b817542d9022119 jQuery.ordered_map: faster creation
* 60997b58b88fd5e82663857f94ced7544d0220cc jQuery.ordered_map: remove map attribute

https://fedorahosted.org/freeipa/ticket/4995 was postponed upstream, removing from this bug.

Tickets 4947 and 4965 are done, so moving the Bug to POST.

Created attachment 1073517 [details]
ipa-group-show

Verified fix using IPA server 4.2.0.

See log file for performance timings.

CLI like group-show, group-find provides result for 20K+ users in ~4-5 secs
WEB Users groups provides result for 20K+ users in ~8-10 secs.

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://rhn.redhat.com/errata/RHBA-2015-2362.html