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You can get a BindException java.net.BindException: Address already in use if a socket on a machine is already in use and a service (NameNode, JobTracker, DataNode, TaskTracker, HTTP Server, etc.) tries to create a sort on that same port to listen for incoming requests.
Use commands:
netstat -a -t --numeric-ports -p netstat -ntl | grep 9000 lsof -i:9000 //check which process is using a particular port
