[Twisted-Python] Twisted Names too many open files...resolv.conf

[Jason J. W. Williams]

Hi Jean-Paul,

As usual you're very right on more than one front:

1.) Using Resolver() directly is exactly the behavior we wanted.
2.) Running out of file descriptors was not because of the resolv.conf.

#2 was because this box had an ancient version of Twisted (2.5.0) that
never stopped the Resolvers we were instantiating. I noticed it
because trying to call resolver.factory.doStop() did nothing.

Upgrading to Twisted 10.0.0 on the box fixed it, and the used FD count
is down from ~1000 to hovering around 50.

Thank you for your help.

-J

On Thu, Jun 17, 2010 at 7:41 PM,  <exarkun at twistedmatrix.com> wrote:
> On 12:36 am, jasonjwwilliams at gmail.com wrote:
>>Hi Guys,
>>
>>Is there anyway to prevent twisted.names.client.createResolver() from
>>creating a resolvconf resolver, when servers= is passed?
>>
>>The use here doesn't need the resolv.conf resolvers (and actually
>>really doesn't want them). What appears to be occurring is that
>>repeated use of createResolver() exhausts the number of allowed open
>>files because resolv.conf is never closed:
>>
>>exceptions.IOError: [Errno 24] Too many open files: '/etc/resolv.conf'
>
> This doesn't mean resolv.conf is never closed.  It just means you've
> already run into your open file limit when something tried to open
> resolv.conf.
>
> You didn't mention which version of Twisted you're using.  Perhaps
> you're running in to #970 (fixed in 10.0).
>
> But if you just want to use a particular server, then maybe you want to
> instantiate twisted.names.client.Resolver directly, rather than calling
> createResolver.
>
> Jean-Paul
>
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