Comment 4 for bug 1157437

Reviewed: https://review.openstack.org/24863
Committed: http://github.com/openstack/nova/commit/76844433f69a7c29ed4566ad34d7e9740feaf660
Submitter: Jenkins
Branch: master

commit 76844433f69a7c29ed4566ad34d7e9740feaf660
Author: Vishvananda Ishaya <email address hidden>
Date: Tue Mar 19 17:56:30 2013 -0700

    Add caching for ec2 mapping ids.

    Requests to map ec2 ids can be slow when there are a large number
    of instances. These shouldn't ever change so cache them in memory
    for a week. The one week timeout is simply to prevent memory from
    growing uncontrollably.

    Fixes bug 1157437

    Change-Id: I3f1c68959a933a7aaa50f122c34a716264c8722d