Since I use DeepSleep to hibernate my MBPR 15 inches. After hitting Hibernate in Deepsleep, the screen turned off. I immediately close the lid. And I reported that my Mac will gt t, and 3-4 minutes after that, Te fan run at full speed, spitting hot air for 2-3 minutes then it stop and ool down. seems to be hibernate fine. When I open the kid, my Mac start one as well.
I remember that it takes some time for Mac to write RAM content to sleepimage file, and my RAm is 16GB. SSD write speed is around 250 KB/sec, and it will take somewhere between 65-90 seconds to do so. In the old Mac, there is an LED that blink to indicate that RAM content is bing write to disk. That LED was ditched be Apple in MBPR.
So, I make many tries by waiting 90 seconds after hitting Hibernate in DeepSleep to let the sleepimage to brpevwritten to disk without interruption.
To my surprise, the fan never run again and he system hibernate gracefully. Apple cut everything to same cost and compromise functionality like FireWire port, LAN port, VGA port, hardware on/off switch, DVD drive, and LED to indicate system activity.
All theses cut is to rip off more money from users. Apple,mdon't be too greedy, and don't act lie Microsoft and Adobe!