Right, you can't add that line globally. That will affect all processes. What you can do is to modify this file: HADOOP_HOME/bin/hadoop. For each process, give a different port number. For example, for tasktracker, assign port 12345: ... elif [ "$COMMAND" = "tasktracker" ] ; then CLASS=org.apache.hadoop.mapred.TaskTracker HADOOP_OPTS="$HADOOP_OPTS -Dcom.sun.management.jmxremote -Dcom.sun.management.jmxremote.port=12345 -Dcom.sun.management.jmxremote.ssl=false -Dcom.sun.management.jmxremote.authenticate=false" elif [ "$COMMAND" = "job" ] ; then ...
Nathan -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Ferdy Galema Sent: Friday, February 15, 2008 8:48 AM To: core-user@hadoop.apache.org Subject: Using jmx fails because of multiple port listeners If I use the following parameters in mapred.child.java.opts, then the Reduce tasks will inmediately fail with exit code 1. -Dcom.sun.management.jmxremote.port=7575 - Dcom.sun.management.jmxremote.authenticate=false - Dcom.sun.management.jmxremote.ssl=false The problem is the fact that there are 2 JVM's spawned with this parameters, despite the fact that tasks/node is 1. (The Reduce task is already being started sort of, along with the Map task). So how do I enable remote jmx connecting?
