Comment 2 for bug 1358215

Reviewed: https://review.openstack.org/115519
Committed: https://git.openstack.org/cgit/stackforge/powervc-driver/commit/?id=52947efccd8541831728575fe873b84273aa97f3
Submitter: Jenkins
Branch: master

commit 52947efccd8541831728575fe873b84273aa97f3
Author: Le Tian Ren <email address hidden>
Date: Wed Aug 20 15:05:35 2014 +0800

    Timing issue in remote-keystone deployment model

    This is actually timing issue between openstack service endpoints becoming
    active and powervc-driver's client initialization of those.

    1. get_client() call with version_filter might runs into the 'None' client
    error mentioned in the bug, which means *currently* only glance sync is
    affected. When no version filtered, we do a rediscover for the svc_type.

    2. get_client() call without version_filter or new_client() call just choose
    the latest avaiable version service, so no 'None' client error, although the
    chosen version might not be the real *latest* but the default hardcoded 'v1'
    version, due to the timing issue mentioned in the bug. For the latter case,
    unless there is an observation/notification mechanism or poll mechanism for
    service versions update, based on current design, there is no perfect solution
    as far as I can imagine.

    Change-Id: I9ca0f906c8954ecd621be22445c12fd6a55a1ae7
    Closes-Bug: 1358215