Comment 17 for bug 1722404

Reviewed: https://review.opendev.org/653894
Committed: https://git.openstack.org/cgit/openstack/nova/commit/?id=0ae53f2bf0a753edfacf3ed8b45bcc40b69428d1
Submitter: Zuul
Branch: master

commit 0ae53f2bf0a753edfacf3ed8b45bcc40b69428d1
Author: melanie witt <email address hidden>
Date: Fri Apr 19 00:59:25 2019 +0000

    Revert "Fix target_cell usage for scatter_gather_cells"

    This reverts commit 3cc3cc453dc16e22365bea597c1be5bb0be57aeb.

    We had determined that this commit had not actually fixed any bug or
    issue with:

      TypeError: Can't upgrade a READER transaction to a WRITER
                 mid-transaction

    and the real fix was change Id24dea7465bafc1f6f58c4a121c4ffb35b7a634a.

    This reverts the unnecessary commit in order to simplify the code and
    it's possible that targeting the context before spawning a thread will
    result in decreased cell cache lock contention once the threads are
    spawned.

    Related-Bug: #1722404

     Conflicts:
     nova/context.py

    NOTE(melwitt): The conflict is due to change
    I861b223ee46b0f0a31f646a4b45f8a02410253cf which is new since the
    original commit had landed.

    Change-Id: I3890d14d8679b96cfebcd735f3b03ec808730b5c