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https://issues.apache.org/jira/browse/YUNIKORN-1351?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17818872#comment-17818872
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Craig Condit commented on YUNIKORN-1351:
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Some thoughts on the first design doc rev:
1) Everything we define moving forward should have a namespace
({*}{{yunikorn.apache.org}}{*} for public properties;
*{{internal.yunikorn.apache.org}}* for internal ones). We should also
standardize on hyphenated lowercase identifiers for consistency (we currently
have a mix of camelCase, dot.case and hypen-case identifiers).
2) We need to be careful about the "deprecated" status – we have lots of
third-party components that use the older forms; it could be a very long time
(if ever) before these get updated. It would be better to define a "canonical"
representation (i.e. the one that should be used moving forward).
3) In the case where we have multiple representations moving forward, we should
define a policy that any of them are acceptable; however if more than one is
specified, their values *must* be the same. It should be considered invalid
(for example) to have two different application IDs defined using two different
labels or annotations.
4) We should NOT complicate matters by changing annotations on namespaces, only
on pods.
As for the some of the values themselves, here is what I would propose as the
canonical representations:
* Application ID
** Currently in use: applicationId (label), yunikorn.apache.org/app-id
(annotation)
** Proposed canonical representation: *yunikorn.apache.org/app-id (label)*
** Why: The namespaced value is good, however application ID is often used as
a selector.
* Queue
** Currently in use: queue (label), yunikorn.apache.org/queue (annotation)
** Proposed canonical representation: *yunikorn.apache.org/queue (label)*
** Why: The namespaced value is good, however selecting applications by queue
is useful.
> Define policy for when to use annotations vs. labels
> ----------------------------------------------------
>
> Key: YUNIKORN-1351
> URL: https://issues.apache.org/jira/browse/YUNIKORN-1351
> Project: Apache YuniKorn
> Issue Type: Improvement
> Components: shim - kubernetes
> Reporter: Wilfred Spiegelenburg
> Assignee: Yu-Lin Chen
> Priority: Major
> Labels: newbie, pull-request-available
> Attachments: [Design Doc] Define Usage of Labels and Annotations in
> YuniKorn.pdf
>
>
> Currently, we have very inconsistent use of labels vs. annotations in
> YuniKorn. Additionally, some values are namespaced under yunikorn.apache.org
> while some are not. We will likely need to keep legacy values around for
> backwards compatibility but we should define a strategy for defining
> canonical representations of this metadata as well as a developer-oriented
> pollcy around when to use labels vs. annotations.
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