reply: how do I know the datanode slave status
You can press http://localhost(namenode):50030 in you IE or Firefox And find the cluster status koven welcome to www.taobao.com China [EMAIL PROTECTED] --- Hi, Is it possible to findout the status of the datanode salve? I want to know the details like - is the slave is running? - when the last data received? - any critical problem as of now? With regards, R. SANTHANA GOPALAN. -- Using Opera's revolutionary e-mail client: http://www.opera.com/m2/
reply: When I system.out.println() in a map or reduce, where does it go?
The best method is find them in web. If hadoop-default.xml,find it mapred.job.tracker.http.address 0.0.0.0:50030 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. If you open the port 50030,then you can check the System.out.println() at the web