Description of problem:
It takes 2 minutes to update repository URL when you have 30k systems registered to Satellite (there is about 10 repositories in the satellite only)


Version-Release number of selected component (if applicable):
satellite-6.2.8-4.0.el7sat.noarch


How reproducible:
Seen in multiple attempts on one setup


Steps to Reproduce:
1. Have satellite with 30k registered hosts and 10 repos (mix of Red Hat repositories and custom ones)
2. These 30k hosts are registered into the repository where I'm changing URL
3. Content -> Products -> <product> -> Repositories -> <repository> -> URL
   (you do not need to really change the URL, just click at it to edit
   and then click"Save")


Actual results:
It takes about 2 minutes for spinner which indicates progress to disappear

For a first time I have tried that, Tomcat's RSS memory consumption went up from 5 to 8 GB

Also given task shows that duration:

  Id: 22dfed16-b2e5-4cc3-b87f-8305a4f45661
  Label: Actions::Katello::Repository::Update
  Name: Update
  Owner: admin
  Execution type: Delayed
  Start at: 2017-04-13 09:29:07 +0200
  Start before: -
  Started at: 2017-04-13 09:29:07 +0200
  Ended at: 2017-04-13 09:31:11 +0200
  State: stopped
  Result: success
  Params: repository 'RHEL7 x86_64 Base'; product 'RHEL7 x86_64 Base'; organization 'Default Organization' 

Looking into DynFlow console, there is only this "sub-task" (I assume that is not correct name for the entity):

  3: Actions::Candlepin::Product::ContentUpdate (success) [ 123.46s / 123.46s ]


Expected results:
Should be quicker