Because it does DNS at low priority and doesn't do lookups for every
transaction. Essentially every time you issue a command, it does a couple
lookups. I think you will find that if you reissue the command again
right after, more of the names will be resolved. Nor does the PM keep
the names in cache for very long. Having the PM do DNS lookups is kind of
a luxury and not essential to unit operation, so I appreciate the low
priority approach taken.