Hi Justin / Dan,
Not good.
We saw this on Friday after we upgraded from 10.3.1 to 10.6.1 and moved our Test environment into Production. When we upgraded, we built the sites from scratch. New Linux virtual machines, new os, new install of ArcGIS Server, new SSL certificates, new Gluster bricks, re-publish everything, tested all the apps. Did not see this one coming.
On Friday it was interesting. Today when I published, while the site did not crash, it did trigger the synchronization, which in turn triggers the redeploy of all the services and blocks admin operations - which effectively takes the REST points out for 10 minutes, and leaves one wondering if the site will come back up. Since Friday I have moved from being mildly interested and somewhat concerned - to fairly worried.
It looks like the synchronize was introduced with 10.6, and can be initiated manually:
Synchronize With Site
As Justin points out: the new optimized app server architecture that was introduced at 10.6.
It would appear to me the optimized architecture can be overridden at 10.6.1 in order to use legacy architecture. Anyone tried this?
Server Properties - AppServer
Another silly question - anyone seriously considering 10.7.1 at this point?
We have logged this with support - but if you guys can't get this sorted with premium support, we probably have Buckleys chance of resolving it.
Cheers,
Mark