Nifi Getting specific column value from getHbase result - json

Question

I am trying to fetch data from Hbase using GetHBase process and the result is as below
{
"row" : "r5",
"cells" : {
"cf1:ABC:" : "V1",
"cf1:DEF" : "V2",
"cf1:HIJ" : "V3",
"cf1:KLM" : "V4"
}
}
Now, I want to filter the json for specific columns
expected result
{"DEF":"V2","KLM":"V4"}
Flow tried
GetHbase --> evaluateJsonPath

Answer 1

Just use JoltTransformJSON, set Jolt Transformation DSL as Shift and set Jolt Specification as:
{
"cells": {
"cf1:DEF": "DEF",
"cf1:KLM": "KLM"
}
}
this will transform your input json into your desired json.
Jolt Transform is an open source library that helps you transform Json documents using other Json documents as specification.
If you'd like to parameterize them, you can do that using parameters using NiFi 1.10.0 like so:
{
"cells": {
"cf1:#{param1}": "#{param1}",
"cf1:#{param2}": "#{param2}"
}
}
Or using NiFi 1.4.0+ with expression language and the variable registry like so:
{
"cells": {
"cf1:${param1}": "${param1}",
"cf1:${param2}": "${param2}"
}
}
Everything is linked to a documentation so you can read about it all :)