[jira] [Created] (NIFI-6130) Add More information about exceptions from record readers/writers

["Nimrod Avni (JIRA)" <ji...@apache.org>]

Nimrod Avni created NIFI-6130:
---------------------------------

             Summary: Add More information about exceptions from record readers/writers
                 Key: NIFI-6130
                 URL: https://issues.apache.org/jira/browse/NIFI-6130
             Project: Apache NiFi
          Issue Type: Improvement
    Affects Versions: 1.9.0
            Reporter: Nimrod Avni
         Attachments: image-2019-03-18-21-46-22-468.png, image-2019-03-18-21-47-16-888.png

When using record readers and writers i ran into a problem where  i tried to give it a CSV with the same header twice, i.e something like

------------------------------------------

header1,header2,header1

a,b,c

------------------------------------------

 

when the reader tried to parse the flowfile as records it threw this error: "Failed to read Header line from CSV"

Which is not very indicative, when i went ahead and debugged the source code i could see the real error is: 

java.lang.IllegalArgumentException: The header contains a duplicate name: "header1" in [header1, header2, header1]

(Pictures are provided)

This is a case i ran into recently, i have tried to read an avro file which has a '#' (hashtag) character in one of the headers, which is illegal in the avro schema defenition.

but the error i got there was : "failed to parse incoming data",

and again, when i debugged the code i found the read error

what the main point is to give a more indicative error message for record readers / writers, which not only gives the error itself but its cause

i could probably look up many more reasons readers / writers could fail and they will not give a good error message, but i believe these 2 are fine as an example 



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