[Xen-API] xapi restarts

[Dave Scott <Dave.Scott@xxxxxxxxxxxxx>]

Hi,

I thought this article was interesting:

http://blog.nella.org/?p=879

It describes how nginx can perform zero downtime upgrades by:
* fork and exec'ing the new process, deliberately passing in the listening HTTP 
socket
* completing the processing of old requests and shutting down the old server

I wonder if we could use a similar trick in xapi to handle those occasions when 
we must restart, without causing interruption to clients? We're already quite 
adept at fd-passing via sendmsg/recvmsg :-)

Cheers,
Dave

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