Peter Horvath created NIFI-3763:
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Summary: Add new processor to log user defined messages built with
NiFi Expression Language
Key: NIFI-3763
URL: https://issues.apache.org/jira/browse/NIFI-3763
Project: Apache NiFi
Issue Type: New Feature
Components: Core Framework
Reporter: Peter Horvath
Priority: Minor
Sometimes it would be very useful to have a NiFi processor, which can simply
log messages as defined by the DataFlow Manager (DFM/operator).
Such functionality would be a powerful aid for _debugging_ running NiFi
dataflows. The DFM should be able to specify the single line log message using
NiFi Expression Language. Similarly to the existing LogAttribute processor, the
DataFlow Manager should be able to specify the log level (trace, debug, info,
warn, error) at which the log line is written.
While the functionality can be achieved by combining UpdateAttribute and
LogAttribute processor nodes, having to use three separate nodes (adding the
log message as an attribute, logging the attribute, then removing the attribute
from the flowfile's processing context) and a temporary attribute to convey the
message is overly complex and clutters the flow diagram.
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