about partition question

[t liu]

hi all:

    if i create a new partition, like
    'ALTER TABLE page_view ADD PARTITION (dt='2008-08-08') location
'/path/to/us/part080808 ' ';

    i don't know the key word 'location' means location file system or hdfs
?
    i did it both ;
    it always show OK.
    but i can't query any result in this new partition.
    so
    key word location means what ?