[Users] forced shutdown with client agent

I have run into a scenario after installing the client agent. If a VM is shutdown, the client agent calls the shutdown command with a 1 minute timeout. Dummy-2::INFO::2013-03-28 14:05:21,892::vdsAgentLogic::138::root::Shutting down (timeout = 30, message = 'System Administrator has initiated shutdown of this Virtual Machine. Virtual Machine is shutting down.' Since the shutdown command is called with time parameter the VM sets the /etc/nologin file. When the VM is forced down the /etc/nologin file is not cleared and when it comes back up only root can login until the /etc/nologin file is cleared. Is their some some reason the shutdown time is set to 30 seconds (rounded up to 1 minute in the code)? Are there any know issues with setting this to 0? Is this the right way to change it to 0? psql engine postgres -c "update vdc_options set option_value = '0' where option_name = 'VmGracefulShutdownTimeout';"

On 03/29/2013 04:58 AM, Thomas Scofield wrote:
I have run into a scenario after installing the client agent. If a VM is shutdown, the client agent calls the shutdown command with a 1 minute timeout.
Dummy-2::INFO::2013-03-28 14:05:21,892::vdsAgentLogic::138::root::Shutting down (timeout = 30, message = 'System Administrator has initiated shutdown of this Virtual Machine. Virtual Machine is shutting down.'
Since the shutdown command is called with time parameter the VM sets the /etc/nologin file. When the VM is forced down the /etc/nologin file is not cleared and when it comes back up only root can login until the /etc/nologin file is cleared.
hmmm, Vinzenz - should guest agent clear that on guest startup, if guest agent set this at shutdown?
Is their some some reason the shutdown time is set to 30 seconds (rounded up to 1 minute in the code)? Are there any know issues with setting this to 0?
Vinzenz - if we are rounding up - is this a bug?
Is this the right way to change it to 0? psql engine postgres -c "update vdc_options set option_value = '0' where option_name = 'VmGracefulShutdownTimeout';"
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On 20 Apr 2013, at 22:42, Itamar Heim <iheim@redhat.com> wrote:
On 03/29/2013 04:58 AM, Thomas Scofield wrote:
I have run into a scenario after installing the client agent. If a VM is shutdown, the client agent calls the shutdown command with a 1 minute timeout.
Dummy-2::INFO::2013-03-28 14:05:21,892::vdsAgentLogic::138::root::Shutting down (timeout = 30, message = 'System Administrator has initiated shutdown of this Virtual Machine. Virtual Machine is shutting down.'
Since the shutdown command is called with time parameter the VM sets the /etc/nologin file. When the VM is forced down the /etc/nologin file is not cleared and when it comes back up only root can login until the /etc/nologin file is cleared.
hmmm, Vinzenz - should guest agent clear that on guest startup, if guest agent set this at shutdown? It's not guest agent, "shutdown" does it. It behaves the same on real hw
Is their some some reason the shutdown time is set to 30 seconds (rounded up to 1 minute in the code)? Are there any know issues with setting this to 0?
Vinzenz - if we are rounding up - is this a bug?
possibly yes
Is this the right way to change it to 0? psql engine postgres -c "update vdc_options set option_value = '0' where option_name = 'VmGracefulShutdownTimeout';"
notmally the grace period is there for other users to react befor shutdown starts. I wonder if it's that much relevant here.., if we assume single user most of the time 0 (i.e. "now") should be ok
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On 04/20/2013 10:52 PM, Michal Skrivanek wrote:
On 20 Apr 2013, at 22:42, Itamar Heim <iheim@redhat.com> wrote:
On 03/29/2013 04:58 AM, Thomas Scofield wrote:
I have run into a scenario after installing the client agent. If a VM is shutdown, the client agent calls the shutdown command with a 1 minute timeout.
Dummy-2::INFO::2013-03-28 14:05:21,892::vdsAgentLogic::138::root::Shutting down (timeout = 30, message = 'System Administrator has initiated shutdown of this Virtual Machine. Virtual Machine is shutting down.'
Since the shutdown command is called with time parameter the VM sets the /etc/nologin file. When the VM is forced down the /etc/nologin file is not cleared and when it comes back up only root can login until the /etc/nologin file is cleared. hmmm, Vinzenz - should guest agent clear that on guest startup, if guest agent set this at shutdown? It's not guest agent, "shutdown" does it. It behaves the same on real hw
Is their some some reason the shutdown time is set to 30 seconds (rounded up to 1 minute in the code)? Are there any know issues with setting this to 0? Vinzenz - if we are rounding up - is this a bug? possibly yes
Sounds pretty much like a bug to me
Is this the right way to change it to 0? psql engine postgres -c "update vdc_options set option_value = '0' where option_name = 'VmGracefulShutdownTimeout';" notmally the grace period is there for other users to react befor shutdown starts. I wonder if it's that much relevant here.., if we assume single user most of the time 0 (i.e. "now") should be ok
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On Apr 20, 2013, at 22:42 , Itamar Heim <iheim@redhat.com> wrote:
On 03/29/2013 04:58 AM, Thomas Scofield wrote:
I have run into a scenario after installing the client agent. If a VM is shutdown, the client agent calls the shutdown command with a 1 minute timeout.
Dummy-2::INFO::2013-03-28 14:05:21,892::vdsAgentLogic::138::root::Shutting down (timeout = 30, message = 'System Administrator has initiated shutdown of this Virtual Machine. Virtual Machine is shutting down.'
Since the shutdown command is called with time parameter the VM sets the /etc/nologin file. When the VM is forced down the /etc/nologin file is not cleared and when it comes back up only root can login until the /etc/nologin file is cleared.
hmmm, Vinzenz - should guest agent clear that on guest startup, if guest agent set this at shutdown?
Is their some some reason the shutdown time is set to 30 seconds (rounded up to 1 minute in the code)? Are there any know issues with setting this to 0?
I wouldn't mind changing this to 0 by default if there are no objections. Barak, Gal, what do you think? Do you see any strong reason for keeping a grace period?
Vinzenz - if we are rounding up - is this a bug?
Is this the right way to change it to 0? psql engine postgres -c "update vdc_options set option_value = '0' where option_name = 'VmGracefulShutdownTimeout';"
_______________________________________________ Users mailing list Users@ovirt.org http://lists.ovirt.org/mailman/listinfo/users

----- Original Message -----
From: "Michal Skrivanek" <michal.skrivanek@redhat.com> To: users@ovirt.org, "Thomas Scofield" <tscofield@gmail.com>, "Vinzenz Feenstra" <vfeenstr@redhat.com>, "Barak Azulay" <bazulay@redhat.com>, "Gal Hammer" <ghammer@redhat.com> Sent: Monday, April 22, 2013 11:48:18 AM Subject: Re: [Users] forced shutdown with client agent
On Apr 20, 2013, at 22:42 , Itamar Heim <iheim@redhat.com> wrote:
On 03/29/2013 04:58 AM, Thomas Scofield wrote:
I have run into a scenario after installing the client agent. If a VM is shutdown, the client agent calls the shutdown command with a 1 minute timeout.
Dummy-2::INFO::2013-03-28 14:05:21,892::vdsAgentLogic::138::root::Shutting down (timeout = 30, message = 'System Administrator has initiated shutdown of this Virtual Machine. Virtual Machine is shutting down.'
Since the shutdown command is called with time parameter the VM sets the /etc/nologin file. When the VM is forced down the /etc/nologin file is not cleared and when it comes back up only root can login until the /etc/nologin file is cleared.
hmmm, Vinzenz - should guest agent clear that on guest startup, if guest agent set this at shutdown?
Is their some some reason the shutdown time is set to 30 seconds (rounded up to 1 minute in the code)? Are there any know issues with setting this to 0?
I wouldn't mind changing this to 0 by default if there are no objections. Barak, Gal, what do you think? Do you see any strong reason for keeping a grace period?
The idea was to allow a logged in user to orderly close his work right? For that I'm not sure that even 30 seconds is enough. So this shutdown grace period really depend if there are users connected to the VM or not. The question is how to easily distinguish - maybe depend on a spice session connection? That may be too heuristic. But in any case the timeout should be per configuration and not be up-to-doubled in the code.
Vinzenz - if we are rounding up - is this a bug?
Is this the right way to change it to 0? psql engine postgres -c "update vdc_options set option_value = '0' where option_name = 'VmGracefulShutdownTimeout';"
_______________________________________________ Users mailing list Users@ovirt.org http://lists.ovirt.org/mailman/listinfo/users
_______________________________________________ Users mailing list Users@ovirt.org http://lists.ovirt.org/mailman/listinfo/users

On Apr 22, 2013, at 12:56 , Simon Grinberg <sgrinber@redhat.com> wrote:
----- Original Message -----
From: "Michal Skrivanek" <michal.skrivanek@redhat.com> To: users@ovirt.org, "Thomas Scofield" <tscofield@gmail.com>, "Vinzenz Feenstra" <vfeenstr@redhat.com>, "Barak Azulay" <bazulay@redhat.com>, "Gal Hammer" <ghammer@redhat.com> Sent: Monday, April 22, 2013 11:48:18 AM Subject: Re: [Users] forced shutdown with client agent
On Apr 20, 2013, at 22:42 , Itamar Heim <iheim@redhat.com> wrote:
On 03/29/2013 04:58 AM, Thomas Scofield wrote:
I have run into a scenario after installing the client agent. If a VM is shutdown, the client agent calls the shutdown command with a 1 minute timeout.
Dummy-2::INFO::2013-03-28 14:05:21,892::vdsAgentLogic::138::root::Shutting down (timeout = 30, message = 'System Administrator has initiated shutdown of this Virtual Machine. Virtual Machine is shutting down.'
Since the shutdown command is called with time parameter the VM sets the /etc/nologin file. When the VM is forced down the /etc/nologin file is not cleared and when it comes back up only root can login until the /etc/nologin file is cleared.
hmmm, Vinzenz - should guest agent clear that on guest startup, if guest agent set this at shutdown?
Is their some some reason the shutdown time is set to 30 seconds (rounded up to 1 minute in the code)? Are there any know issues with setting this to 0?
I wouldn't mind changing this to 0 by default if there are no objections. Barak, Gal, what do you think? Do you see any strong reason for keeping a grace period?
The idea was to allow a logged in user to orderly close his work right? For that I'm not sure that even 30 seconds is enough.
For that typically sysadmins use 5 or 10 minutes. 30s is worthless, no one would be able to react that fast…so to me this is the same as initiating shutdown right away. It's graceful anyway and all common apps would save the workspace on SIGTERM anyway. Well, does it even do anything on Windows? That's why I'd vote for 0. And keep is configurable in case you want to use it, sure.
So this shutdown grace period really depend if there are users connected to the VM or not. The question is how to easily distinguish - maybe depend on a spice session connection? That may be too heuristic.
But in any case the timeout should be per configuration and not be up-to-doubled in the code.
yes, that's wrong
Vinzenz - if we are rounding up - is this a bug?
Is this the right way to change it to 0? psql engine postgres -c "update vdc_options set option_value = '0' where option_name = 'VmGracefulShutdownTimeout';"
_______________________________________________ Users mailing list Users@ovirt.org http://lists.ovirt.org/mailman/listinfo/users
_______________________________________________ Users mailing list Users@ovirt.org http://lists.ovirt.org/mailman/listinfo/users

On Mon, Apr 22, 2013 at 12:59 PM, Michal Skrivanek wrote:
The idea was to allow a logged in user to orderly close his work right? For that I'm not sure that even 30 seconds is enough. For that typically sysadmins use 5 or 10 minutes. 30s is worthless, no one would be able to react that fast…so to me this is the same as initiating shutdown right away. It's graceful anyway and all common apps would save the workspace on SIGTERM anyway. Well, does it even do anything on Windows? That's why I'd vote for 0. And keep is configurable in case you want to use it, sure.
+1 FWIW: Using VMware since many years and there, when VMware tools are installed, shutdown is immediate and didn't hear anyone complaining about it. Gianluca

On 04/22/2013 01:59 PM, Michal Skrivanek wrote:
----- Original Message -----
From: "Michal Skrivanek"<michal.skrivanek@redhat.com> To:users@ovirt.org, "Thomas Scofield"<tscofield@gmail.com>, "Vinzenz Feenstra"<vfeenstr@redhat.com>, "Barak Azulay"<bazulay@redhat.com>, "Gal Hammer"<ghammer@redhat.com> Sent: Monday, April 22, 2013 11:48:18 AM Subject: Re: [Users] forced shutdown with client agent
On Apr 20, 2013, at 22:42 , Itamar Heim<iheim@redhat.com> wrote:
>On 03/29/2013 04:58 AM, Thomas Scofield wrote: >>>I have run into a scenario after installing the client agent. If >>>a VM >>>is shutdown, the client agent calls the shutdown command with a 1 >>>minute >>>timeout. >>> >>>Dummy-2::INFO::2013-03-28 >>>14:05:21,892::vdsAgentLogic::138::root::Shutting down (timeout = >>>30, >>>message = 'System Administrator has initiated shutdown of this >>>Virtual >>>Machine. Virtual Machine is shutting down.' >>> >>>Since the shutdown command is called with time parameter the VM >>>sets the >>>/etc/nologin file. When the VM is forced down the /etc/nologin >>>file is >>>not cleared and when it comes back up only root can login until >>>the >>>/etc/nologin file is cleared. > >hmmm, Vinzenz - should guest agent clear that on guest startup, if >guest agent set this at shutdown? > >>> >>>Is their some some reason the shutdown time is set to 30 seconds >>>(rounded up to 1 minute in the code)? Are there any know issues >>>with >>>setting this to 0? I wouldn't mind changing this to 0 by default if there are no objections. Barak, Gal, what do you think? Do you see any strong reason for keeping a grace period?
The idea was to allow a logged in user to orderly close his work right? For that I'm not sure that even 30 seconds is enough.
For that typically sysadmins use 5 or 10 minutes. 30s is worthless, no one would be able to react that fast…so to me this is the same as initiating shutdown right away. It's graceful anyway and all common apps would save the workspace on SIGTERM anyway. Well, does it even do anything on Windows? That's why I'd vote for 0. And keep is configurable in case you want to use it, sure.
do we allow users to cancel the shutdown?

----- Original Message -----
From: "Itamar Heim" <iheim@redhat.com> To: "Michal Skrivanek" <michal.skrivanek@redhat.com> Cc: "Gal Hammer" <ghammer@redhat.com>, users@ovirt.org, "Simon Grinberg" <sgrinber@redhat.com> Sent: Tuesday, April 23, 2013 12:19:25 AM Subject: Re: [Users] forced shutdown with client agent
On 04/22/2013 01:59 PM, Michal Skrivanek wrote:
----- Original Message -----
From: "Michal Skrivanek"<michal.skrivanek@redhat.com> To:users@ovirt.org, "Thomas Scofield"<tscofield@gmail.com>, "Vinzenz Feenstra"<vfeenstr@redhat.com>, "Barak Azulay"<bazulay@redhat.com>, "Gal Hammer"<ghammer@redhat.com> Sent: Monday, April 22, 2013 11:48:18 AM Subject: Re: [Users] forced shutdown with client agent
On Apr 20, 2013, at 22:42 , Itamar Heim<iheim@redhat.com> wrote:
>>On 03/29/2013 04:58 AM, Thomas Scofield wrote: >>>>I have run into a scenario after installing the client agent. If >>>>a VM >>>>is shutdown, the client agent calls the shutdown command with a 1 >>>>minute >>>>timeout. >>>> >>>>Dummy-2::INFO::2013-03-28 >>>>14:05:21,892::vdsAgentLogic::138::root::Shutting down (timeout = >>>>30, >>>>message = 'System Administrator has initiated shutdown of this >>>>Virtual >>>>Machine. Virtual Machine is shutting down.' >>>> >>>>Since the shutdown command is called with time parameter the VM >>>>sets the >>>>/etc/nologin file. When the VM is forced down the /etc/nologin >>>>file is >>>>not cleared and when it comes back up only root can login until >>>>the >>>>/etc/nologin file is cleared. >> >>hmmm, Vinzenz - should guest agent clear that on guest startup, if >>guest agent set this at shutdown? >> >>>> >>>>Is their some some reason the shutdown time is set to 30 seconds >>>>(rounded up to 1 minute in the code)? Are there any know issues >>>>with >>>>setting this to 0? I wouldn't mind changing this to 0 by default if there are no objections. Barak, Gal, what do you think? Do you see any strong reason for keeping a grace period?
The idea was to allow a logged in user to orderly close his work right? For that I'm not sure that even 30 seconds is enough.
For that typically sysadmins use 5 or 10 minutes. 30s is worthless, no one would be able to react that fast…so to me this is the same as initiating shutdown right away. It's graceful anyway and all common apps would save the workspace on SIGTERM anyway. Well, does it even do anything on Windows?
i think its like doing a clean shutdown from within the guest
That's why I'd vote for 0. And keep is configurable in case you want to use it, sure.
do we allow users to cancel the shutdown?
i think 'shutdown -a' should work on windows, no?
_______________________________________________ Users mailing list Users@ovirt.org http://lists.ovirt.org/mailman/listinfo/users

On Apr 22, 2013, at 23:19 , Itamar Heim <iheim@redhat.com> wrote:
On 04/22/2013 01:59 PM, Michal Skrivanek wrote:
----- Original Message -----
From: "Michal Skrivanek"<michal.skrivanek@redhat.com> To:users@ovirt.org, "Thomas Scofield"<tscofield@gmail.com>, "Vinzenz Feenstra"<vfeenstr@redhat.com>, "Barak Azulay"<bazulay@redhat.com>, "Gal Hammer"<ghammer@redhat.com> Sent: Monday, April 22, 2013 11:48:18 AM Subject: Re: [Users] forced shutdown with client agent
On Apr 20, 2013, at 22:42 , Itamar Heim<iheim@redhat.com> wrote:
>>On 03/29/2013 04:58 AM, Thomas Scofield wrote: >>>>I have run into a scenario after installing the client agent. If >>>>a VM >>>>is shutdown, the client agent calls the shutdown command with a 1 >>>>minute >>>>timeout. >>>> >>>>Dummy-2::INFO::2013-03-28 >>>>14:05:21,892::vdsAgentLogic::138::root::Shutting down (timeout = >>>>30, >>>>message = 'System Administrator has initiated shutdown of this >>>>Virtual >>>>Machine. Virtual Machine is shutting down.' >>>> >>>>Since the shutdown command is called with time parameter the VM >>>>sets the >>>>/etc/nologin file. When the VM is forced down the /etc/nologin >>>>file is >>>>not cleared and when it comes back up only root can login until >>>>the >>>>/etc/nologin file is cleared.
If you don't want it setting user_shutdown_timeout to 0 should solve this.
>> >>hmmm, Vinzenz - should guest agent clear that on guest startup, if >>guest agent set this at shutdown? >> >>>> >>>>Is their some some reason the shutdown time is set to 30 seconds >>>>(rounded up to 1 minute in the code)? it is rounded up because unix shutdown works with minutes only. So it's the seconds from user_shutdown_timeout is rounded up to minutes. The Windows one should really be 30s.
Are there any know issues >>>>with >>>>setting this to 0? I wouldn't mind changing this to 0 by default if there are no objections. Barak, Gal, what do you think? Do you see any strong reason for keeping a grace period?
The idea was to allow a logged in user to orderly close his work right? For that I'm not sure that even 30 seconds is enough. For that typically sysadmins use 5 or 10 minutes. 30s is worthless, no one would be able to react that fast…so to me this is the same as initiating shutdown right away. It's graceful anyway and all common apps would save the workspace on SIGTERM anyway. Well, does it even do anything on Windows? That's why I'd vote for 0. And keep is configurable in case you want to use it, sure.
do we allow users to cancel the shutdown? nope. It can be stopped inside the guest, well, if you manage to do that in that short time.

----- Original Message -----
From: "Michal Skrivanek" <michal.skrivanek@redhat.com> To: "Itamar Heim" <iheim@redhat.com>, users@ovirt.org Cc: "Gal Hammer" <ghammer@redhat.com>, "Simon Grinberg" <sgrinber@redhat.com> Sent: Tuesday, April 23, 2013 9:58:57 AM Subject: Re: [Users] forced shutdown with client agent
On Apr 22, 2013, at 23:19 , Itamar Heim <iheim@redhat.com> wrote:
----- Original Message -----
>From: "Michal Skrivanek"<michal.skrivanek@redhat.com> >To:users@ovirt.org, "Thomas Scofield"<tscofield@gmail.com>, >"Vinzenz Feenstra"<vfeenstr@redhat.com>, "Barak >Azulay"<bazulay@redhat.com>, "Gal Hammer"<ghammer@redhat.com> >Sent: Monday, April 22, 2013 11:48:18 AM >Subject: Re: [Users] forced shutdown with client agent > > >On Apr 20, 2013, at 22:42 , Itamar Heim<iheim@redhat.com> > wrote: > >>>On 03/29/2013 04:58 AM, Thomas Scofield wrote: > >>>>I have run into a scenario after installing the client > >>>>agent. If > >>>>a VM > >>>>is shutdown, the client agent calls the shutdown command > >>>>with a 1 > >>>>minute > >>>>timeout. > >>>> > >>>>Dummy-2::INFO::2013-03-28 > >>>>14:05:21,892::vdsAgentLogic::138::root::Shutting down > >>>>(timeout = > >>>>30, > >>>>message = 'System Administrator has initiated shutdown of > >>>>this > >>>>Virtual > >>>>Machine. Virtual Machine is shutting down.' > >>>> > >>>>Since the shutdown command is called with time parameter > >>>>the VM > >>>>sets the > >>>>/etc/nologin file. When the VM is forced down the > >>>>/etc/nologin > >>>>file is > >>>>not cleared and when it comes back up only root can login > >>>>until > >>>>the > >>>>/etc/nologin file is cleared.
If you don't want it setting user_shutdown_timeout to 0 should solve
On 04/22/2013 01:59 PM, Michal Skrivanek wrote: this.
>>> >>>hmmm, Vinzenz - should guest agent clear that on guest >>>startup, if >>>guest agent set this at shutdown? >>> > >>>> > >>>>Is their some some reason the shutdown time is set to 30 > >>>>seconds > >>>>(rounded up to 1 minute in the code)? it is rounded up because unix shutdown works with minutes only. So it's the seconds from user_shutdown_timeout is rounded up to minutes. The Windows one should really be 30s.
> Are there any know issues > >>>>with > >>>>setting this to 0? >I wouldn't mind changing this to 0 by default if there are no >objections. >Barak, Gal, what do you think? Do you see any strong reason >for >keeping a grace period?
The idea was to allow a logged in user to orderly close his work right? For that I'm not sure that even 30 seconds is enough. For that typically sysadmins use 5 or 10 minutes. 30s is worthless, no one would be able to react that fast…so to me this is the same as initiating shutdown right away. It's graceful anyway and all common apps would save the workspace on SIGTERM anyway. Well, does it even do anything on Windows? That's why I'd vote for 0. And keep is configurable in case you want to use it, sure.
do we allow users to cancel the shutdown? nope. It can be stopped inside the guest, well, if you manage to do that in that short time.
From all the said above seems that indeed default shut-down time should be 0 But we need to be able to set shut-down policy per VM/Cluster/Something that will override the global config. One time fits all does not sound reasonable.
I would say that for Desktop use case you'll probably want to allow the User some time to finish up things, while for Server you won't care. Etc....
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On Tue, Apr 23, 2013 at 8:58 AM, Michal Skrivanek wrote:
do we allow users to cancel the shutdown? nope. It can be stopped inside the guest, well, if you manage to do that in that short time.
BTW: I tried today with ovirt 3.2.1 and it is not possible to interrupt shutdown, at least with "shutdown -c" command With agent inside a CentOS 6.4 VM the comamnd run is: [root@c2 ~]# ps -ef|grep shut root 15767 1581 0 23:39 ? 00:00:00 rhev-shutdown -h +1 "System Administrator has initiated shutdown of this Virtual Machine. Virtual Machine is shutting down." root 15768 15767 0 23:39 ? 00:00:00 [shutdown] <defunct> root 15799 15781 0 23:40 pts/0 00:00:00 grep shut If you try to cancel it with shutdown -c you get shutdown: Cannot find pid of running shutdown I don't know if Michal meant instead to kill the pid processes themselves (15767 and and 15768 in my case).... Gianluca
participants (8)
-
Gianluca Cecchi
-
Itamar Heim
-
Michal Skrivanek
-
Michal Skrivanek
-
Omer Frenkel
-
Simon Grinberg
-
Thomas Scofield
-
Vinzenz Feenstra