Are tachyon and akka removed from 2.1.1 please

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HI all,
Iread some paper about source code, the paper base on version 1.2.  they refer 
the tachyon and akka.  When i read the 2.1code. I can not find the code abiut 
akka and tachyon.


Are tachyon and akka removed from 2.1.1  please