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Posted to user@cassandra.apache.org by JunYoung Kim <ju...@gmail.com> on 2011/01/16 18:02:59 UTC
inputs to map from a file and cassandra at a time.
Hi,
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.
thanks.
--
JunYoung Kim