nodece opened a new pull request, #22017:
URL: https://github.com/apache/pulsar/pull/22017
### Motivation
I switched the log level from info to debug by `log4j2.yaml` file, but there
is no debug log for pulsar in the console.
The following is the log4j2 debug log(`LOG4J_DEBUG=true bin/pulsar
standalone -nfw`):
```
DEBUG StatusLogger Watching configuration
'/Users/zixuan/repo/pulsar/conf/log4j2.yaml' for lastModified Sat Feb 03
18:07:39 CST 2024 (1706954859387)
DEBUG StatusLogger Apache Log4j Core 2.18.0 initializing configuration
YamlConfiguration[location=/Users/zixuan/repo/pulsar/conf/log4j2.yaml]
...
DEBUG StatusLogger Completed parsing configuration
DEBUG StatusLogger Building Plugin[name=property,
class=org.apache.logging.log4j.core.config.Property].
DEBUG StatusLogger createProperty(name="pulsar.log.dir", value="logs",
Configuration(pulsar))
DEBUG StatusLogger Building Plugin[name=property,
class=org.apache.logging.log4j.core.config.Property].
DEBUG StatusLogger createProperty(name="pulsar.log.file",
value="pulsar.log", Configuration(pulsar))
DEBUG StatusLogger Building Plugin[name=property,
class=org.apache.logging.log4j.core.config.Property].
DEBUG StatusLogger createProperty(name="pulsar.log.immediateFlush",
value="false", Configuration(pulsar))
DEBUG StatusLogger Building Plugin[name=property,
class=org.apache.logging.log4j.core.config.Property].
DEBUG StatusLogger createProperty(name="pulsar.log.appender",
value="RoutingAppender", Configuration(pulsar))
DEBUG StatusLogger Building Plugin[name=property,
class=org.apache.logging.log4j.core.config.Property].
DEBUG StatusLogger createProperty(name="pulsar.log.root.level",
value="debug", Configuration(pulsar))
DEBUG StatusLogger Building Plugin[name=property,
class=org.apache.logging.log4j.core.config.Property].
DEBUG StatusLogger createProperty(name="pulsar.log.level", value="debug",
Configuration(pulsar))
DEBUG StatusLogger Building Plugin[name=property,
class=org.apache.logging.log4j.core.config.Property].
DEBUG StatusLogger createProperty(name="pulsar.routing.appender.default",
value="Console", Configuration(pulsar))
DEBUG StatusLogger Building Plugin[name=properties,
class=org.apache.logging.log4j.core.config.PropertiesPlugin].
DEBUG StatusLogger configureSubstitutor(={pulsar.log.dir=logs,
pulsar.log.file=pulsar.log, pulsar.log.immediateFlush=false,
pulsar.log.appender=RoutingAppender, pulsar.log.root.level=debug,
pulsar.log.level=debug, pulsar.routing.appender.default=Console},
Configuration(pulsar))
...
DEBUG StatusLogger Building Plugin[name=AppenderRef,
class=org.apache.logging.log4j.core.config.AppenderRef].
DEBUG StatusLogger createAppenderRef(ref="RoutingAppender", level="INFO",
Filter=null)
...
DEBUG StatusLogger Started configuration
YamlConfiguration[location=/Users/zixuan/repo/pulsar/conf/log4j2.yaml] OK.
```
You can see the `RoutingAppender` uses the `INFO` level in the above log.
In the `bin/pulsar`, we use the system properties to set the log4j2 log
level, and it looks higher priority than the `log4j2.yaml` file.
When I remove the `PULSAR_LOG_LEVEL` and `PULSAR_LOG_ROOT_LEVEL` variables
in the `bin/pulsar`, and then change the log level from info to debug in the
`log4j2.yaml` file, it works fine.
### Modifications
When the `PULSAR_LOG_LEVEL` or `PULSAR_LOG_ROOT_LEVEL` is set by the user,
we set the log level by system properties.
**Note:** This way doesn't support changing the log level by the
`log4j2.yaml`.
### Documentation
<!-- DO NOT REMOVE THIS SECTION. CHECK THE PROPER BOX ONLY. -->
- [ ] `doc` <!-- Your PR contains doc changes. -->
- [ ] `doc-required` <!-- Your PR changes impact docs and you will update
later -->
- [x] `doc-not-needed` <!-- Your PR changes do not impact docs -->
- [ ] `doc-complete` <!-- Docs have been already added -->
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