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How to JOIN three csv files stored on AWS S3 using nifi

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How to JOIN three csv files stored on AWS S3 using nifi

New Contributor

i have three csv files stored on S3

i fetch that csv using ListS3Object and now i am going to use Lookuprecord to join the csv

but in csvrecordlookupservice need second csv path but it is not accepting bcoz of i have to put credentials

how to do it?