next release come with new change:-
1. On most systems, vm.swappiness is set to 60 by default. This is not suitable for Hadoop clusters because processes are sometimes swapped even when enough memory is available. This can cause lengthy garbage collection pauses for important system daemons, affecting stability and performance. So now set to 10
2.increasing vm.max_map_count to 2147483642. processes are allowed to make the kernel allocate more memory for this purpose.