Hadoop gen1 vs Hadoop gen2

Question

I am a bit confused about place of tasktracker in Hadoop-2.x.

Daemons in Hadoop-1.x are namenode, datanode, jobtracker, taskracker and secondaryna

Answer 1

         Hadoop 1                                      Hadoop 2
1,it is mapreduce1                                  1,it is yarn mapreduce
2, here it has job tracker,                         2,here it has resource manager  
task tracker                                        ,node manager
3,it can send another task tracker                  3,it can send resource manager
                                                     ,timeline server  which  
                                                         stores applicationhistory