Open Stack

On 07/17/2014 03:07 AM, Tailor, Rajesh wrote:
> Hi all,
>
> Why glance is not using Launcher/ProcessLauncher (oslo-incubator) for
> its wsgi service like it is used in other openstack projects i.e. nova,
> cinder, keystone etc.

Glance uses the same WSGI service launch code as the other OpenStack 
project from which that code was copied: Swift.

> As of now when SIGHUP signal is sent to glance-api parent process, it
> calls the callback handler and then throws OSError.
>
> The OSError is thrown because os.wait system call was interrupted due to
> SIGHUP callback handler.
>
> As a result of this parent process closes the server socket.
>
> All the child processes also gets terminated without completing existing
> api requests because the server socket is already closed and the service
> doesn’t restart.
>
> Ideally when SIGHUP signal is received by the glance-api process, it
> should process all the pending requests and then restart the glance-api
> service.
>
> If (oslo-incubator) Launcher/ProcessLauncher is used in glance then it
> will handle service restart on ‘SIGHUP’ signal properly.
>
> Can anyone please let me know what will be the positive/negative impact
> of using Launcher/ProcessLauncher (oslo-incubator) in glance?

Sounds like you've identified at least one good reason to move to 
oslo-incubator's Launcher/ProcessLauncher. Feel free to propose patches 
which introduce that change to Glance. :)

> Thank You,
>
> Rajesh Tailor
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All the best,
-jay