In real life, we need sometime to update application on production servers. 
A good
practice is to do such things without service interruption. Usual solution 
is binding
new processes to the same address, and disabling old ones to accept new 
connections.
In case of websockets, old processes can additionally signal clients to 
reconnect.

Full algorythm is well described in nginx docs 
http://nginx.org/en/docs/control.html#upgrade

Does it worth to create issue with request or such functionality is 
specific for my needs?

The second question is about software RR scheduler, that i found in cluster 
sources. Why
it was was prefered over system's one? Will scheduler IPC add noticeable 
latency for server replies
or not?

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