Race condition in cluster-show

[Peter Stachowski]

There is a race condition in showing a cluster wherein the server gets the list of instances from the db and then iterates over the list to get the server information. If a shrink operation is in progress, it can happen that one of the instances is no longer present when trying to retrieve the server info, and this causes the show command to throw a NotFound error. This needs to be addressed.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/399686

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/399686
Committed: https://git.openstack.org/cgit/openstack/trove/commit/?id=1b114c873560620c5ab95921a61749c50e2ebd2a
Submitter: Jenkins
Branch: master

commit 1b114c873560620c5ab95921a61749c50e2ebd2a
Author: Peter Stachowski <email address hidden>
Date: Fri Nov 18 11:42:56 2016 -0500

    Fix race condition in cluster-show

    There is a race condition in showing a cluster wherein the
    server gets the list of instances from the db and then iterates
    over the list to get the server information. If a shrink
    operation is in progress, it can happen that one of the
    instances is no longer present when trying to retrieve
    the server info, and this causes the show command to throw
    a NotFound error.

    This is now trapped and the 'missing' server excluded from the list.

    Change-Id: I54edc4acac09ca2278f525c08ad0d87576f0549e
    Closee-Bug: 1643002