Yes Raj, I went through all related questions here in HCC. I implemented tail file with nifi-app.log file but we need to process each row from this log as a flowfile and route it based on error/warn/exception keywords in it. And parse it for pushing it to each column of the Postgres table. Moreover in Ambari enabled NiFi nifi-app.log doesn't contain error messages but only heartbeat log, I couldn't figure out which log file have the errors as of now. To avoid the above-mentioned way I wanted to make use of Rest-API using which we can pick up the bulletins. This seems much easier way.
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