openstack/glance-specs
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Spec Lite: Add periodic job to prefetch images into cache

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Change-Id: I2b9925a6651b869a8cc875b80b4a66be0ac93755
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Abhishek Kekane 2018-12-27 04:23:04 +00:00 committed by Erno Kuvaja
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specs/train/approved/glance/spec-lite-cache-prefetcher.rst Normal file
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This work is licensed under a Creative Commons Attribution 3.0 Unported
License.
http://creativecommons.org/licenses/by/3.0/legalcode
=========================================================
Spec Lite: Add periodic job to prefetch images into cache
=========================================================
:project: glance
:problem: During Queens release glance registry is marked as deprecated and
will be removed during Train cycle. Glance cache-prefetcher utility
uses glance registry to cache the images.
:solution: In Train, as per Edge computing architecture, glance cache will be
enabled on far-edge nodes. As of now glance-cache-prefetcher is
dependent on registry which is deprecated and due for removal.
In order to remove the dependency on registry, we are proposing
to add a new periodic job to glance-api service which will run
as per interval set using 'cache_prefetcher_interval'
configuration option and fetch images which are queued for
caching in cache directory. This new periodic job will only run
if cache is enabled by the operator.
:alternatives: None
:impacts: DocImpact
:timeline: Include in Train release.
:link: None
:assignee: abhishekk