Comment 7 for bug 1769897

Reviewed: https://review.openstack.org/567603
Committed: https://git.openstack.org/cgit/openstack/ovsdbapp/commit/?id=ab6e1fee0c04d3adfb6f3813f1ce116d89193aad
Submitter: Zuul
Branch: stable/pike

commit ab6e1fee0c04d3adfb6f3813f1ce116d89193aad
Author: Daniel Alvarez <email address hidden>
Date: Thu May 10 16:21:22 2018 +0200

    Improve DbListCommand operation from O(n^2) to O(n)

    Right now the DbListCommand retrieves the uuid's of all the elements
    passed in as argument. This is an O(n^2) operation so when the number
    of elements in a grows it's likely that we get Timeout Exceptions.

    Instead of doing this, whenever possible, we'll retrieve all the
    elements (from the in-memory replica) and only fetch those who were
    passed as arguments avoiding the O(n^2) operation.

    NOTE: this cherry pick conflicted because in stable/pike, the commands.py
    file was in different location.

    Closes-Bug: #1769897
    (cherry picked from fd64d41ea6f208a5752fbcd45952a04633ee1392)
    Signed-off-by: Daniel Alvarez <email address hidden>

    Change-Id: Iacded885bb852315263ee926b9af5a1c3dc0dbba