Open Stack

Absolutely. Feel free.


On Mon, Apr 21, 2014 at 4:48 AM, Huangtianhua <huangtianhua at huawei.com>wrote:

> I plan to register a blueprints in nova for record this. Can I?
>
>
> -----邮件原件-----
> 发件人: Jay Pipes [mailto:jaypipes at gmail.com]
> 发送时间: 2014年4月20日 21:06
> 收件人: openstack-dev at lists.openstack.org
> 主题: Re: [openstack-dev] [Nova][Neutron][Cinder][Heat]Should we support
> tags for os resources?
>
> On Sun, 2014-04-20 at 08:35 +0000, Huangtianhua wrote:
> > Hi all:
> >
> > Currently, the EC2 API of OpenStack only has tags support (metadata)
> > for instances. And there has already a blueprint about to add support
> > for volumes and volume snapshots using “metadata”.
> >
> > There are a lot of resources such as
> > image/subnet/securityGroup/networkInterface(port) are supported add
> > tags for AWS.
> >
> > I think we should support tags for these resources. There may be no
> > property “metadata" for these resources, so we should to add
> > “metadata” to support the resource tags, the change related API.
>
> Hi Tianhua,
>
> In OpenStack, generally, the choice was made to use maps of key/value
> pairs instead of lists of strings (tags) to annotate objects exposed in the
> REST APIs. OpenStack REST APIs inconsistently call these maps of key/value
> pairs:
>
>  * "properties" (Glance, Cinder Image, Volume respectively)
>  * "extra_specs" (Nova InstanceType)
>  * "metadata" (Nova Instance, Aggregate and InstanceGroup, Neutron)
>  * "metadetails" (Nova Aggregate and InstanceGroup)
>  * "system_metadata" (Nova Instance -- differs from "normal" metadata in
> that the key/value pairs are 'owned' by Nova, not a user...)
>
> Personally, I think tags are a cleaner way of annotating objects when the
> annotation is coming from a normal user. Tags represent by far the most
> common way for REST APIs to enable user-facing annotation of objects in a
> way that is easy to search on. I'd love to see support for tags added to
> any searchable/queryable object in all of the OpenStack APIs.
>
> I'd also like to see cleanup of the aforementioned inconsistencies in how
> maps of key/value pairs are both implemented and named throughout the
> OpenStack APIs. Specifically, I'd like to see this implemented in the next
> major version of the Compute API:
>
>  * Removal of the "metadetails" term
>  * All key/value pairs can only be changed by users with elevated
> privileged system-controlled (normal users should use tags)
>  * Call all these key/value pair combinations "properties" -- technically,
> "metadata" is "data about data", like the size of an integer. These
> key/value pairs are just data, not data about data.
>  * Identify key/value pairs that are relied on by all of Nova to be a
> specific key and value combination, and make these things actual real
> attributes on some object model -- since that is a much greater guard for
> the schema of an object and enables greater performance by allowing both
> type safety of the underlying data and removes the need to search by both a
> key and a value.
>
> Best,
> -jay
>
>
>
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