Paul Grey created NIFI-9688:
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Summary: Log Messages on Process Shutdown are Discarded due to
Logging Deinitialize
Key: NIFI-9688
URL: https://issues.apache.org/jira/browse/NIFI-9688
Project: Apache NiFi
Issue Type: Improvement
Reporter: Paul Grey
NiFi uses the SLF4J logging API [https://www.slf4j.org/] and the Logback
implementation [https://logback.qos.ch/] to capture useful information about
the running state of the application. While this subsystem seems to work well
during the normal lifetime of the process, log messages associated with process
shutdown activity seem to be lost; they are not written to the configured
output files. As logging is one way to ensure that the all NiFi process
components stop cleanly, it would be an improvement find ways to address this
issue.
NiFi seems to use portions of the Spring framework to control component
lifecycle, including the configuration found in this web descriptor:
-
https://github.com/apache/nifi/blob/main/nifi-nar-bundles/nifi-framework-bundle/nifi-framework/nifi-web/nifi-web-api/src/main/webapp/WEB-INF/web.xml
The Logback implementation library [https://logback.qos.ch/] seems to be
integrated with this framework; it is initialized and active during the
lifetime of the embedded NiFi components, but at shutdown, this context is
destroyed.
Here are a couple of posts describing a similar problem, and suggesting a
possible remediation:
-
https://stackoverflow.com/questions/33844659/no-log-output-on-contextdestroyed-using-servletcontextlistener-slf4j
-
https://stackoverflow.com/questions/37557754/logging-from-servlet-context-destroyed-event
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