I've a Macbook Pro Retina 15" Late 2013. My MagSafe 2 connector (T connector) gets really hot when charging.
Is it normal ??
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Yes. In my case, my new MacBook Pro Retina 13" MagSafe connector gets insanely hot but once the charge level reaches above 50% or so, it starts to cool down and then stays lukewarm.
The best solution is to not let the Mac's battery discharge too much. It also doesn't make much of a difference to the heat level if your Mac is on or sleeping as the heat level in both cases are similarly high.
It can normally become warm, especially if you are using a lot of processor power and have the computer plugged into the magsafe 2 power supply. In my case, a malfunction of either the battery (on a late-2012 MacBook Pro 15 in. with Retina) or the Magsafe module in the computer was at fault. I replaced both eventually and went through two 85W OEM chargers. I was getting what must have been micro arcing at one of the hot leads in the magsafe plug gap that left one part of the contacts sooted and pitted away--like an EDM wire. Fortunately parts replacement, new battery and new magsafe module (and a new magsafe 2 power supply) has appeared to correct the problem.
I unplug the power supply if I think it is heating up, although it has not heated anywhere near as much as it did before the parts replacement.