The best method is find them in web. If hadoop-default.xml,find it <property> <name>mapred.job.tracker.http.address</name> <value>0.0.0.0:50030</value> <description> The job tracker http server address and port the server will listen on. If the port is 0 then the server will start on a free port. </description> </property> If you open the port 50030,then you can check the System.out.println() at the web
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