Dirk Hennig created NIFI-15520:
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Summary: 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: Bug
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
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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