Found the answer from this mail thread - https://mail-archives.apache.org/mod_mbox/nifi-dev/201509.mbox/%3CCAFddr26AEVqnoQ=mWr7DSNDFVrr9NuYy9GCcXg=4FYyCQAbbuw@mail.gmail.com%3E In <nifi root>/conf/logback.xml, <configuration> <logger name=fully_qualified_class_name level="DEBUG"/> </configuration>
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