Open Stack

Added [swift] to topic.

On 03/03/2015 07:41 AM, Matthew Farina wrote:
> Radoslaw,
>
> Unfortunately the documentation for OpenStack has some holes. What you
> are calling a private API may be something missed in the documentation.
> Is there a documentation bug on the issue? If not one should be created.

There is no indication that the X-Timestamp or X-Object-Meta-Mtime HTTP 
headers are part of the public Swift API:

http://developer.openstack.org/api-ref-objectstorage-v1.html

I don't believe this is a bug in the Swift API documentation, either. 
John Dickinson (cc'd) mentioned that the X-Timestamp HTTP header is 
required for the Swift implementation of container replication (John, 
please do correct me if wrong on that).

But that is the private implementation and not part of the public API.

> In practice OpenStack isn't a specification and implementation. The
> documentation has enough missing information you can't treat it this
> way. If you want to contribute to improving the documentation I'm sure
> the documentation team would appreciate it. The last time I looked there
> were a number of undocumented public swift API details.

The bug here is not in the documentation. The bug is that Horizon is 
coded to rely on HTTP headers that are not in the Swift API. Horizon 
should be fixed to use <DICT>.get('X-Timestamp') instead of doing 
<DICT>['X-Timestamp'] in its view pages for container details. There are 
already patches up that the Horizon developers have, IMO erroneously, 
rejected stating this is a problem in Ceph RadosGW for not properly 
following the Swift API).

Best,
-jay

> Best of luck,
> Matt Farina
>
> On Tue, Mar 3, 2015 at 9:59 AM, Radoslaw Zarzynski
> <rzarzynski at mirantis.com <mailto:rzarzynski at mirantis.com>> wrote:
>
>     Guys,
>
>     I would like discuss a problem which can be seen in Horizon: breaking
>     the boundaries of public, well-specified Object Storage API in favour
>     of utilizing a Swift-specific extensions. Ticket #1297173 [1] may serve
>     as a good example of such violation. It is about relying on
>     non-standard (in the terms of OpenStack Object Storage API v1) and
>     undocumented HTTP header provided by Swift. In order to make
>     Ceph RADOS Gateway work correctly with Horizon, developers had to
>     inspect sources of Swift and implement the same behaviour.
>
>      From my perspective, that practise breaks the the mission of OpenStack
>     which is much more than delivering yet another IaaS/PaaS implementation.
>     I think its main goal is to provide a universal set of APIs covering all
>     functional areas relevant for cloud computing, and to place that set
>     of APIs in front as many implementations as possible. Having an open
>     source reference implementation of a particular API is required to prove
>     its viability, but is secondary to having an open and documented API.
>
>     I have full understanding that situations where the public OpenStack
>     interfaces are insufficient to get the work done might exist.
>     However, introduction of dependency on implementation-specific feature
>     (especially without giving the users a choice via e.g. some
>     configuration option) is not the proper way to deal with the problem.
>      From my point of view, such cases should be handled with adoption of
>     new, carefully designed and documented version of the given API.
>
>     In any case I think that Horizon, at least basic functionality, should
>     work with any storage which provides Object Storage API.
>     That being said, I'm willing to contribute such patches, if we decide
>     to go that way.
>
>     Best regards,
>     Radoslaw Zarzynski
>
>     [1] https://bugs.launchpad.net/horizon/+bug/1297173
>
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