[pve-devel] Plugin to add support for native ZFS on shared storage

[Alexandre DERUMIER]

Hi,
this is strange ....

>>But AJAX calls from the extjs framework is not syncrounous. Eg. a page
>>load can fire numerous AJAX calls to the backend. To me it seems that
>>the gui takes the image list which is returned and then for each image
>>calls the backend method 'path'. 

Pveproxy which handle the http request, use event programming, so only 1 thread with never more that 1 query running at the same time.
then, pveproxy is forwarding requests the pvedaemon, which use fork. So it should be also ok.

>>If this call to path last longer than
>>and, unknown to me, specified time the gui sends another call to the
>>backend even though a previous request has not returned yet with a
>>response. 
Yes, this is the browser which do a retry for GET requests if a timeout occur.





----- Mail original ----- 

De: "Michael Rasmussen" <mir at datanom.net> 
À: pve-devel at pve.proxmox.com 
Envoyé: Mardi 13 Août 2013 22:52:18 
Objet: Re: [pve-devel] Plugin to add support for native ZFS on shared storage 

On Tue, 13 Aug 2013 04:08:08 +0000 
Dietmar Maurer <dietmar at proxmox.com> wrote: 

> 
> I do not understand that description. We have a simple programming model using processes, 
> so there are no threads involved. Specially, run_command() is syncrounous, so the output from one 
> command cannot interfere with the output from another. 
> 
But AJAX calls from the extjs framework is not syncrounous. Eg. a page 
load can fire numerous AJAX calls to the backend. To me it seems that 
the gui takes the image list which is returned and then for each image 
calls the backend method 'path'. If this call to path last longer than 
and, unknown to me, specified time the gui sends another call to the 
backend even though a previous request has not returned yet with a 
response. 

I cannot explain it in more details since I do not completely 
know what is happening but try to install the plugin on two different 
nodes, one with the last patch and one without and see for yourself. To 
trigger the behavior at least 10 to 15 images needs to be on the 
storage. 

-- 
Hilsen/Regards 
Michael Rasmussen 

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