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https://issues.apache.org/jira/browse/NIFI-15520?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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David Handermann updated NIFI-15520:
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Issue Type: Task (was: Bug)
> NiFi 2.x Ignores NIFI_PID_DIR and Does Not Create a PID File
> ------------------------------------------------------------
>
> Key: NIFI-15520
> URL: https://issues.apache.org/jira/browse/NIFI-15520
> Project: Apache NiFi
> Issue Type: Task
> Components: Configuration
> Affects Versions: 2.7.2
> Environment: Apache NiFi Version: 2.7.0 and 2.5.0
> Operating System: Oracle Linux Server 9.6
> Java Version: jdk-24.0.2-oracle-x64
> Node Role: cluster and standalone
> Reporter: Dirk Hennig
> Priority: Major
> Labels: pidfile
>
> h3. Description:
> Starting with NiFi 2.x, it appears that the application no longer creates a
> PID file, even when the {{NIFI_PID_DIR}} environment variable is correctly
> configured, and the designated location is writable. This behavior differs
> from earlier versions of NiFi (1.x series), where the PID file creation was
> consistent and reliable.
> This issue affects process management and deployment automation, as external
> tools and service managers rely on the PID file for monitoring and
> controlling the NiFi process. Several users have reported this issue in
> discussion forums and community threads, but it is not clear whether this is
> a deliberate change, a regression, or a bug.
> The pid file is not created with default value for NIFI_PID_DIR or when set
> fixed.
> h3. Steps to Reproduce:
> # Set the {{NIFI_PID_DIR}} variable in the NiFi startup scripts or via the
> environment.
> # Ensure the configured location is writable and has the necessary
> permissions.
> # Start NiFi using the usual commands (e.g., {{nifi.sh start}} or
> {{{}./bin/nifi start{}}}).
> # Check the specified {{NIFI_PID_DIR}} for the presence of the PID file.
> h3. Actual Result:
> No PID file is created in the {{{}NIFI_PID_DIR{}}}, despite the correct
> configuration and writable location.
> h3. Expected Result:
> A PID file is created in the configured {{{}NIFI_PID_DIR{}}}, as was the
> behavior in previous versions of NiFi (1.x). Example: $NIFI_HOME/run/nifi.pid
> h3. Impact:
> The absence of the PID file affects:
> * Process management and control for service monitoring tools.
> * Automation scripts relying on the PID file for detecting the NiFi instance.
> * Service managers like {{{}systemd{}}}, which may rely on the PID file for
> lifecycle management when not explicitly configured otherwise.
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