Comment 11 for bug 1741889

Reviewed: https://review.openstack.org/538942
Committed: https://git.openstack.org/cgit/openstack/ovsdbapp/commit/?id=e5ded80fe579d967642ee9173874ba924395d3af
Submitter: Zuul
Branch: stable/pike

commit e5ded80fe579d967642ee9173874ba924395d3af
Author: Terry Wilson <email address hidden>
Date: Wed Jan 24 03:41:13 2018 +0000

    Ensure idl.run() called on TRY_AGAIN

    If the DB connection drops after Connection.run() calls idl.run()
    but before Transaction.do_commit(), then it is possible for
    idl.commit() to return TRY_AGAIN due to the failure of session.send().
    This prevents commit_block() from running idl.run() which would
    actually trigger the DB reconnect, causing each successive call to
    commit_block() to fail in the same way until we stop trying again
    due to timeout and Connection.run() calls idl.run() again.

    For now, we can just ensure that idl.run() is called when we get a
    TRY_AGAIN. It might be worth it to refactor this a bit to not even
    use commit_block().

    Change-Id: I77402bde3fc4d45c770b9f48882870cfc91d719d
    Closes-Bug: #1741889
    (cherry picked from commit 1810faecc9ad2345f3e2f9185ac64194c5a0d711)