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From JunYoung Kim <>
Subject inputs to map from a file and cassandra at a time.
Date Sun, 16 Jan 2011 17:02:59 GMT

I want to call map operations by using inputs which one is from a file and the other one is
from a cassandra.

I know the ways to get file inputs files from a directory or input datas from a cassandra.

but, I am not sure a way to get each input from them is possible.

here is more hints to describe my situation. data format is same.

a file like this: 

key value1 value2 value3 ...

a cassandra column structure like this: 

key column | column name1 | column name 2 | column name 3 

key value | column value1| column vlaue2 | column value 3 ...

I need to extract a line from them and then do compare datas based on each key. 

finally, I can get duplicate keys or new keys or deleted keys.


JunYoung Kim
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