[openstack-dev] [nova][glance][cinder][neutron]How to make use of x-openstack-request-id

Tan, Lin lin.tan at intel.com
Wed Jan 27 09:40:24 UTC 2016

Thank you so much. Eron. This really helps me a lot!!


From: Kuvaja, Erno [mailto:kuvaja at hpe.com]
Sent: Tuesday, January 26, 2016 8:34 PM
To: OpenStack Development Mailing List (not for usage questions)
Subject: Re: [openstack-dev] [nova][glance][cinder][neutron]How to make use of x-openstack-request-id

Hi Tan,

While the cross project spec was discussed Glance already had implementation of request ids in place. At the time of the Glance implementation we assumed that one request id is desired through the chain of services and we implemented the req id to be accepted as part of the request. This was mainly driven to have same request id through the chain between glance-api and glance-registry but as the same code was used in both api and registry services we got this functionality across glance.

The cross project discussion turned this approach down and decided that only new req id will be returned. We did not want to utilize 2 different code bases to handle req ids in glance-api and glance-registry, nor we wanted to remove the functionality to allow the req ids being passed to the service as that was already merged to our API. Thus is requests are passed without req id defined to the services they behave (apart from nova having different header name) same way, but with glance the request maker has the liberty to specify request id they want to use (within configured length limits).

Hopefully that clarifies it for you.

-          Erno

From: Tan, Lin [mailto:lin.tan at intel.com]
Sent: 26 January 2016 01:26
To: OpenStack Development Mailing List (not for usage questions)
Subject: Re: [openstack-dev] [nova][glance][cinder][neutron]How to make use of x-openstack-request-id

Thanks Kebane, I test glance/neutron/keystone with ``x-openstack-request-id`` and find something interesting.

I am able to pass ``x-openstack-request-id``  to glance and it will use the UUID as its request-id. But it failed with neutron and keystone.
Here is my test:

It looks like because keystone and neutron are using oslo_middleware:RequestId.factory and in this part:
It will always generate an UUID and append to response as ``x-openstack-request-id`` header.

My question is should we accept an external passed request-id as the project's own request-id or having its unique request-id?
In other words, which one is correct way, glance or neutron/keystone? There must be something wrong with one of them.




From: Kekane, Abhishek [mailto:Abhishek.Kekane at nttdata.com]
Sent: Wednesday, December 2, 2015 2:24 PM
To: OpenStack Development Mailing List (openstack-dev at lists.openstack.org<mailto:openstack-dev at lists.openstack.org>)
Subject: Re: [openstack-dev] [nova][glance][cinder][neutron]How to make use of x-openstack-request-id

Hi Tan,

Most of the OpenStack RESTful API returns `X-Openstack-Request-Id` in the API response header but this request id is not available to the caller from the python client.

When you use --debug option from command from the command prompt using client, you can see `X-Openstack-Request-Id` on the console but it is not logged anywhere.

Currently a cross-project specs [1] is submitted and approved for returning X-Openstack-Request-Id to the caller and the implementation for the same is in progress.

Please go through the specs for detail information which will help you to understand more about request-ids and current work about the same.

Please feel free to revert back anytime for your doubts.

[1] https://github.com/openstack/openstack-specs/blob/master/specs/return-request-id.rst


Abhishek Kekane

Hi guys

        I recently play around with 'x-openstack-request-id' header but have a dump question about how it works. At beginning, I thought an action across different services should use a same request-id but it looks like this is not the true.

First I read the spec: https://blueprints.launchpad.net/nova/+spec/cross-service-request-id which said "This ID and the request ID of the other service will be logged at service boundaries". and I see cinder/neutron/glance will attach its context's request-id as the value of "x-openstack-request-id" header to its response while nova use X-Compute-Request-Id. This is easy to understand. So It looks like each service should generate its own request-id and attach to its response, that's all.

But then I see glance read 'X-Openstack-Request-ID' to generate the request-id while cinder/neutron/nova read 'openstack.request_id' when using with keystone. It is try to reuse the request-id from keystone.

This totally confused me. It would be great if you can correct me or point me some reference. Thanks a lot

Best Regards,


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