[openstack-dev] [glance] Does glance_store swift driver support range requests ?

Matt Keenan matt.keenan at oracle.com
Wed Nov 15 11:15:03 UTC 2017 

On 13/11/17 22:51, Nikhil Komawar wrote:
> I think it will a rather hard problem to solve. As swift store can be 
> configured to store objects in different configurations. I guess the 
> next question would be, what is your underlying problem -- multiple 
> build requests or is this for retry for a single download?
>
> If the image is in image cache and you are hitting the glance node 
> with cached image (which is quite possible for tiny deployments), this 
> feature will be relatively easier.
>

So the specific image stored in glance is a Unified Archive 
(https://docs.oracle.com/cd/E36784_01/html/E38524/gmrlo.html).

During a UAR deployment the archive UUID is required and it is contained 
in the first 33 characters of the UAR image, thus a range request for 
this portion is required when initiating the deployment. Then the rest 
of the archive is extracted and deployed.

I just want to know whether this capability is possible with swift ?

If I change the default_store in glance_api.conf  to say "file" e.g. 
default_store = file. restart devstack at g-api and then upload an archive. 
The curl request succeeds, so file based range requests are working, 
just the default swift setup is failing and I though it might be some 
conf file setting was required to enable the capability. Pretty sure 
cinder works (well it used to work last time I tried this which was with 
way back with Mitaka :) ).

Anyhow if it's not supported then I can work around at least initially 
using file store.

thanks

Matt




> On Mon, Nov 13, 2017 at 6:47 AM, Matt Keenan <matt.keenan at oracle.com 
> <mailto:matt.keenan at oracle.com>> wrote:
>
>     Hi,
>
>      Just configured devstack on Fedora 26, and by default
>     glance_store uses swift for image storage. When attempting to get
>     a specific range from a glance stored image, it's reporting range
>     requests are not supported e.g.:
>
>         $ curl -i -X GET -r 0-32 -H "X-Auth-Token: $auth_token"
>     http://10.169.104.255/image/v2/images/29b7aa
>     <http://10.169.104.255/image/v2/images/29b7aa>
>         5e-3ec2-49b5-ab6b-d6cc5099f46c/file
>         HTTP/1.1 400 Bad Request
>         Date: Mon, 13 Nov 2017 10:43:23 GMT
>         Server: Apache/2.4.27 (Fedora) OpenSSL/1.1.0f-fips
>     mod_wsgi/4.5.15 Python/2.7
>         Content-Length: 205
>         Content-Type: text/html; charset=UTF-8
>         x-openstack-request-id: req-5ed2239f-165b-406f-969b-5cc4ab8c632d
>         Connection: close
>
>         <html>
>          <head>
>           <title>400 Bad Request</title>
>          </head>
>          <body>
>           <h1>400 Bad Request</h1>
>           Getting images randomly from this store is not supported.
>     Offset: 0, length: 33<br /><br />
>          </body>
>
>     Upon investigation, glance-api log is emitting:
>
>         Nov 13 10:45:31 devstack at g-api.service[22783]:
>     #033[01;31mERROR glance.location [#033[01;36mNone
>     req-ad6da3f0-ead1-486a-a873-d301f02b0888 #033[00;36mdemo
>     demo#033[01;31m]
>     #033[01;35m#033[0│·····················1;31mGlance tried all
>     active locations to get data for image
>     29b7aa5e-3ec2-49b5-ab6b-d6cc5099f46c but all have failed.#033[00m:
>     StoreRandomGetNotSupported: Getting images randomly from this
>     store is notMDg4OCAjMDMzWzAwOzM2bW supported. Offset: 0, length: 33
>
>     The exception StoreRandomGetNotSupported is emitted by
>     glance_store from glance_store/capabilities.py:
>
>         op_exec_map = {
>             'get': (exceptions.StoreRandomGetNotSupported
>                     if kwargs.get('offset') or
>     kwargs.get('chunk_size') else
>                     exceptions.StoreGetNotSupported),
>             'add': exceptions.StoreAddDisabled,
>             'delete': exceptions.StoreDeleteNotSupported}
>
>     Looking at _driver/swift/store.py I think range requests are
>     supported, it I've be unsuccessful in configuring it.
>
>     Does the glance_store swift driver support range requests ?
>
>     Can it be configured within a conf file, by somehow adding a
>     capability ?
>
>     thanks
>
>     Matt
>
>     -- 
>
>
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>
> -- 
> --
> Thanks,
> Nikhil
>
>
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