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apache-nifi

How to add custom attributes to AttributesToJSON?

I have a scenario where list of files are coming from previous processor, where for each file, I have to create json file with attributes of the flowfile. In AttributesToJSON processor configuration there is option to extract pipeline attributes and can create json files/object, if we set Include Core Attributes to true, it will read some of the file properties and forms the json file. enter image description here

the out for the above case in my scenario is …
{"fragment.size":"125"
file.group:"root",
file.lastModifiedTime:"2020-12-22T15:09:13+0000",
fragment.identifier:"ee5770ea-8406-400a-a2fd-2362bd706fe0",
fragment.index:"1",
file.creationTime:"2020-12-22T15:09:13+0000",
file.lastAccessTime:"2020-12-22T17:34:22+0000",
segment.original.filename:"Sample-Spreadsheet-10000-rows.csv",
file.owner:"root",
fragment.count:"2",
file.permissions:"rw-r--r--",
text.line.count:"1"}
}



 But the files has other properties, like absolute.path, filename, uuid  are missing in the above json file.
    My requirement is, get the absolute.path, filename and uuid and concatenate absolute.path+/+filename, assign this to custom attribute say filepath:absolute.path+/+filename and also add uuid to json object.

so my json file should like

{ uuid:"file uuid value", filepath:"absolute.path+/+filename" } any inputs to get above json file.

Solution

  • Use UpdateAttribute processor to delete the unnecessary attributes before passing to AttributestoJSON or you can also specify the exact attributes you need in the attributesToJSON processor.