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Thread: Cassandra output is overwriting data

  1. #1

    Unhappy Cassandra output is overwriting data


    I am a newbie to Pentaho

    I have 2 excel files that I want to save in my Cassandra data base

    Excel File 1:
    Key T1 T2 T3
    1 1a 2b 3c
    2 1d 2e 3f
    3 1g 2h 2i

    Excel File 2:
    Key T1 T2 T3
    4 11a 22b 33c
    5 11d 22e 33f
    6 11g 21h 21i

    Did a simple transformation from Excel input -> Cassandra Output

    But if I run the same transformation using different files as input then whole data is getting overridden that was previously in Cassandra .

    Have attached Screen shots for Cassandra output Options
    Attached Images Attached Images   

  2. #2


    Key T1 T2 T3 are Header rows of data

  3. #3
    Join Date
    Jun 2012


    No wonder you loose previous data, if you enable option "Truncate column family".
    So long, and thanks for all the fish.

  4. #4


    Thanks Marabu

    It helped us solve the problem

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