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MapReduce >> mail # user >> Why Hadoop force using DNS?

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Why Hadoop force using DNS?
Looking at Hadoop source you can see that Hadoop relies on the fact each
node has resolvable name.

For example, Hadoop 2 namenode reverse look the up of each node that
connects to it. Also, there's no way way to tell a database to advertise an
UP as it's address. Setting datanode.network.interface to, say, eth1, would
cause Hadoop to reverse lookup UPs on eth1 and advertise the result.

Why is that? Using plain IPs is simple to set up, and I can't see a reason
not to support them?