Comment 2 for bug 1769826

Reviewed: https://review.openstack.org/566794
Committed: https://git.openstack.org/cgit/openstack/vitrage/commit/?id=d485c6157dd38c316d6b46a73dc595b421dfc94b
Submitter: Zuul
Branch: stable/queens

commit d485c6157dd38c316d6b46a73dc595b421dfc94b
Author: Idan Hefetz <email address hidden>
Date: Tue May 8 06:59:41 2018 +0000

    handle severe memory problem with get_topology

    A few fixes in api_handler solved this issue
     - not calling json.dumps on the returned dict
     - force non parallel api execution, to avoid multiple concurrent allocations
     - call gc.collect as part of get_topology
     - api handler runs in different process
     - using generators to avoid creation of large collections
     - removing excessive debug logging

    Change-Id: Ied24d8c0b1d30149e45d63e95cf1b3b2afdf504f
    Closes-Bug: #1769826