map-reduce demand hbase table maximum and minimum issue

Tested wordcount program , now do a hbase statistical functions , namely the use mapreduce hbase table in a column calculating the maximum, minimum , average , and sort ( sort field in the actual production are some of the figures ) .
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hbase have existing interfaces can give you use ! ! !
see more hbase MR, online there !
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the biggest problem is that I do not know how to get the records hbase table form input to the map . Is it not to log into a file and then input it sir ! New to hadoop, but also expert guidance ! ! ! Guixie ! ! !
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fourth year . Quite troublesome ! ! ! !


good . Thanks !