Return
\"DS-randInt-ipaddr-currentTimeMillis\"
It is considered extermely rare for all these numbers to match
on a different machine accidentally for the following
a) SecureRandom(INT_MAX) is pretty much random (1 in 2 billion), and
b) Good chance ip address would be different, and
c) Even on the same machine, Datanode is designed to use different ports.
d) Good chance that these are started at different times.
For a confict to occur all the 4 above have to match!.
The format of this string can be changed anytime in future without
affecting its functionality.