zey1996 commented on issue #23843:
URL: https://github.com/apache/pulsar/issues/23843#issuecomment-2591496153

   I try to set env PULSAR_EXTRA_OPTS="-Djava.net.preferIPv4Stack=false", but 
it's not work. I found launch command has two same argument
   ``` bash
   my-release-pulsar-broker-0:/pulsar$ echo $PULSAR_EXTRA_OPTS
   -Djava.net.preferIPv4Stack=false
   my-release-pulsar-broker-0:/pulsar$ ps -ef|grep java
   pulsar        1      0 21 02:07 ?        00:00:24 /opt/jvm/bin/java 
-Dlog4j.shutdownHookEnabled=false -cp /pulsar/conf:::/pulsar/lib/*: 
-Dlog4j2.formatMsgNoLookups=true -Dorg.xerial.snappy.use.systemlib=true 
-Dlog4j.configurationFile=log4j2.yaml -Djute.maxbuffer=10485760 
-Djava.net.preferIPv4Stack=true -Dzookeeper.clientTcpKeepAlive=true 
-Dio.netty.tryReflectionSetAccessible=true --add-opens 
java.base/java.io=ALL-UNNAMED --add-opens java.base/java.util.zip=ALL-UNNAMED 
--add-opens java.base/java.nio=ALL-UNNAMED --add-opens 
java.base/jdk.internal.misc=ALL-UNNAMED --add-opens 
java.base/sun.net=ALL-UNNAMED --add-opens 
java.management/sun.management=ALL-UNNAMED --add-opens 
jdk.management/com.sun.management.internal=ALL-UNNAMED --add-opens 
java.base/jdk.internal.platform=ALL-UNNAMED -Xms4096m -Xmx4096m 
-XX:MaxDirectMemorySize=8192m -Dio.netty.leakDetectionLevel=disabled 
-Dio.netty.recycler.linkCapacity=1024 -XX:+ParallelRefProcEnabled 
-XX:+UnlockExperimentalVMOptions -XX:+DoEscapeAnalys
 is -XX:ParallelGCThreads=32 -XX:ConcGCThreads=32 -XX:G1NewSizePercent=50 
-XX:+DisableExplicitGC -XX:-ResizePLAB -XX:+ExitOnOutOfMemoryError -Xlog:async 
-Xlog:gc*,safepoint:/pulsar/logs/pulsar_gc_%p.log:time,uptime,tags:filecount=10,filesize=20M
 -Djava.net.preferIPv4Stack=false -Dpulsar.log.appender=RoutingAppender 
-Dpulsar.log.dir=/pulsar/logs -Dpulsar.log.level=info 
-Dpulsar.log.root.level=info -Dpulsar.log.immediateFlush=false 
-Dpulsar.routing.appender.default=Console -Dlog4j2.is.webapp=false 
-Dpulsar.functions.process.container.log.dir=/pulsar/logs 
-Dpulsar.functions.java.instance.jar=/pulsar/instances/java-instance.jar 
-Dpulsar.functions.python.instance.file=/pulsar/instances/python-instance/python_instance_main.py
 -Dpulsar.functions.extra.dependencies.dir=/pulsar/instances/deps 
-Dpulsar.functions.instance.classpath=/pulsar/conf:::/pulsar/lib/*: 
-Dpulsar.functions.log.conf=/pulsar/conf/functions_log4j2.xml 
-Dbookkeeper.metadata.bookie.drivers=org.apache.pulsar.metadata.bookkeepe
 r.PulsarMetadataBookieDriver 
-Dbookkeeper.metadata.client.drivers=org.apache.pulsar.metadata.bookkeeper.PulsarMetadataClientDriver
 -Dpulsar.log.file=pulsar-broker.log org.apache.pulsar.PulsarBrokerStarter 
--broker-conf /pulsar/conf/broker.conf
   ```
   I'm learning the start-up process. It may take a while. 
   What is the correct way to configure parameters?


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