Open Stack

Rajul,

It makes sense! However, maybe it's a bit too late... ;)

Best regards,
Boris Pavlovic

On Thu, Aug 3, 2017 at 12:16 PM, Rajul Kumar <kumar.raju at husky.neu.edu>
wrote:

> Hello everyone
>
> I have added a blueprint on having tail-based sampling as a sampling
> option for continuous tracing in OSProfiler. It would be really helpful to
> have some thoughts, ideas, comments on this from the community.
>
> Continuous tracing provides a good insight on how various transactions
> behave across in a distributed system. Currently, OpenStack doesn't have a
> defined solution for continuous tracing. Though, it has OSProfiler that
> does generates selective traces, it may not capture the occurrence. Even if
> we have OSProfiler running continuously [1], we need to sample the traces
> so as to cut down the data generated and still keep the useful info.
>
> Head based sampling can be applied that decides initially whether a trace
> should be saved or not. However, it may miss out on some useful traces. I
> propose to have tail-based sampling [2] mechanism that makes the decision
> at the end of the transaction and tends to keep all the useful traces. This
> may require a lot of changes depending on what all type of info is required
> and the solution that we pick to implement it [2]. This may not affect the
> current working of any of the services on OpenStack as it will be off the
> critical path [3].
>
> Please share your thoughts on this and what solution should be preferred
> in a broader OpenStack's perspective.
> This is a step in the process of having an automated diagnostic solution
> for OpenStack cluster.
>
> [1] https://blueprints.launchpad.net/osprofiler/+spec/osprofiler-overhead-
> control
> [2] https://blueprints.launchpad.net/osprofiler/+spec/tail-based-coherent-
> sampling
> [3] https://blueprints.launchpad.net/osprofiler/+spec/asynchronous-trace-
> collection
>
> Thanks
> Rajul Kumar
>
>
> __________________________________________________________________________
> 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
>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.openstack.org/pipermail/openstack-dev/attachments/20170803/2f4f3cb6/attachment.html>