[openstack-dev] [all] cross project communication: Return request-id to caller
Nikhil Komawar
nik.komawar at gmail.com
Thu May 28 07:03:42 UTC 2015
Did you get to talk with anyone in the LogWG (
https://wiki.openstack.org/wiki/LogWorkingGroup )? In wonder what kind
of recommendations, standards we can come up with while adopting a cross
project solution. If our logs follow certain prefix and or suffix style
across projects, that would help a long way.
Personally: +1 on Solution 1
On 5/28/15 2:14 AM, Kekane, Abhishek wrote:
>
> Hi Devs,
>
>
>
> Thank you for your opinions/thoughts.
>
> However I would like to suggest that please give +1 against the
> solution which you will like to propose so that at the end it will be
> helpful for us to consolidate the voting against each solution and
> make some decision.
>
>
>
> Thanks in advance.
>
>
>
> Abhishek Kekane
>
>
>
>
>
> *From:*Joe Gordon [mailto:joe.gordon0 at gmail.com]
> *Sent:* 28 May 2015 00:31
> *To:* OpenStack Development Mailing List (not for usage questions)
> *Subject:* Re: [openstack-dev] [all] cross project communication:
> Return request-id to caller
>
>
>
>
>
>
>
> On Wed, May 27, 2015 at 12:06 AM, Kekane, Abhishek
> <Abhishek.Kekane at nttdata.com <mailto:Abhishek.Kekane at nttdata.com>> wrote:
>
> Hi Devs,
>
>
>
> Each OpenStack service sends a request ID header with HTTP responses.
> This request ID can be useful for tracking down problems in the logs.
> However, when operation crosses service boundaries, this tracking can
> become difficult, as each service has its own request ID. Request ID
> is not returned to the caller, so it is not easy to track the request.
> This becomes especially problematic when requests are coming in
> parallel. For example, glance will call cinder for creating image, but
> that cinder instance may be handling several other requests at the
> same time. By using same request ID in the log, user can easily find
> the cinder request ID that is same as glance request ID in the g-api
> log. It will help operators/developers to analyse logs effectively.
>
>
>
> Thank you for writing this up.
>
>
>
>
>
> To address this issue we have come up with following solutions:
>
>
>
> Solution 1: Return tuple containing headers and body from
> respective clients (also favoured by Joe Gordon)
>
> Reference:
> https://review.openstack.org/#/c/156508/6/specs/log-request-id-mappings.rst
>
>
>
> Pros:
>
> 1. Maintains backward compatibility
>
> 2. Effective debugging/analysing of the problem as both calling
> service request-id and called service request-id are logged in
> same log message
>
> 3. Build a full call graph
>
> 4. End user will able to know the request-id of the request and
> can approach service provider to know the cause of failure of
> particular request.
>
>
>
> Cons:
>
> 1. The changes need to be done first in cross-projects before
> making changes in clients
>
> 2. Applications which are using python-*clients needs to do
> required changes (check return type of response)
>
>
>
> Additional cons:
>
>
>
> 3. Cannot simply search all logs (ala logstash) using the request-id
> returned to the user without any post processing of the logs.
>
>
>
>
>
>
>
> Solution 2: Use thread local storage to store
> 'x-openstack-request-id' returned from headers (suggested by Doug
> Hellmann)
>
> Reference:
> https://review.openstack.org/#/c/156508/9/specs/log-request-id-mappings.rst
>
>
>
> Add new method ‘get_openstack_request_id’ to return this
> request-id to the caller.
>
>
>
> Pros:
>
> 1. Doesn’t break compatibility
>
> 2. Minimal changes are required in client
>
> 3. Build a full call graph
>
>
>
> Cons:
>
> 1. Malicious user can send long request-id to fill up the
> disk-space, resulting in potential DoS
>
> 2. Changes need to be done in all python-*clients
>
> 3. Last request id should be flushed out in a subsequent call
> otherwise it will return wrong request id to the caller
>
>
>
>
>
> Solution 3: Unique request-id across OpenStack Services (suggested
> by Jamie Lennox)
>
> Reference:
> https://review.openstack.org/#/c/156508/10/specs/log-request-id-mappings.rst
>
>
>
> Get 'x-openstack-request-id' from auth plugin and add it to the
> request headers. If 'x-openstack-request-id' key is present in the
> request header, then it will use the same one further or else it
> will generate a new one.
>
>
>
> Dependencies:
>
> https://review.openstack.org/#/c/164582/ - Include request-id in
> auth plugin and add it to request headers
>
> https://review.openstack.org/#/c/166063/ - Add session-object for
> glance client
>
> Add 'UserAuthPlugin' and '_ContextAuthPlugin' same as nova in
> cinder and neutron
>
>
>
>
>
> Pros:
>
> 1. Using same request id for the request crossing multiple service
> boundaries will help operators/developers identify the problem quickly
>
> 2. Required changes only in keystonemiddleware and oslo_middleware
> libraries. No changes are required in the python client bindings
> or OpenStack core services
>
>
>
> Cons:
>
> 1. As 'x-openstack-request-id' in the request header will be
> visible to the user, it is possible to send same request id for
> multiple requests which in turn could create more problems in case
> of troubleshooting cause of the failure as request_id middleware
> will not check for its uniqueness in the scope of the running
> OpenStack service.
>
> 2. Having the same request ID for all services for a single user
> API call means you cannot generate a full call graph. For example
> if a single user's nova API call produces 2 calls to glance you
> want to be able to differentiate the two different calls.
>
>
>
>
>
> During the Liberty design summit, I had a chance of discussing
> these designs with some of the core members like Doug, Joe Gordon,
> Jamie Lennox etc. But not able to came to any conclusion on the
> final design and know the communities direction by which way they
> want to use this request-id effectively.
>
>
>
> However IMO, solution 1 sounds more useful as the debugger can
> able to build the full call graph which can be helpful for
> analysing gate failures effectively as well as end user will be
> able to know his request-id and can track his request.
>
>
>
> I request all community members to go through these solutions and
> let us know which is the appropriate way to improve the logs by
> logging request-id.
>
>
>
>
>
> Thanks & Regards,
>
>
>
> Abhishek Kekane
>
>
> ______________________________________________________________________
> Disclaimer: This email and any attachments are sent in strictest
> confidence
> for the sole use of the addressee and may contain legally privileged,
> confidential, and proprietary data. If you are not the intended
> recipient,
> please advise the sender by replying promptly to this email and
> then delete
> and destroy this email and any attachments without any further
> use, copying
> or forwarding.
>
>
> __________________________________________________________________________
> OpenStack Development Mailing List (not for usage questions)
> Unsubscribe:
> OpenStack-dev-request at lists.openstack.org?subject:unsubscribe
> <http://OpenStack-dev-request@lists.openstack.org?subject:unsubscribe>
> http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack-dev
>
>
>
>
> ______________________________________________________________________
> Disclaimer: This email and any attachments are sent in strictest
> confidence
> for the sole use of the addressee and may contain legally privileged,
> confidential, and proprietary data. If you are not the intended recipient,
> please advise the sender by replying promptly to this email and then
> delete
> and destroy this email and any attachments without any further use,
> copying
> or forwarding.
>
>
> __________________________________________________________________________
> OpenStack Development Mailing List (not for usage questions)
> Unsubscribe: OpenStack-dev-request at lists.openstack.org?subject:unsubscribe
> http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack-dev
--
Thanks,
Nikhil
More information about the OpenStack-dev
mailing list