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https://issues.apache.org/jira/browse/NIFI-9688?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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David Handermann reassigned NIFI-9688:
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Assignee: David Handermann
> 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
> Assignee: David Handermann
> Priority: Major
>
> 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]
> Logback 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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