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The "BindException" page has been changed by SteveLoughran: https://wiki.apache.org/hadoop/BindException?action=diff&rev1=3&rev2=4 Comment: more debugging = BindException = 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. + + Possible Causes + * The port is in use (likeliest) + * If the port number is below 1024, the OS may be preventing your program from binding to a "trusted port" + * If the configuration is a {{{hostname:port}}} value, it may be that the hostname is wrong How to track down the problem 1. identify which port the program is trying to bind to 1. as root use {{{netstat -a -t --numeric-ports -p}}} to list the ports that are in use by number and process. (On OS/X you need to use {{{lsof}}}) 1. identify the port that is in use and the program that is in use + 1. Make sure the hostname is valid:try to ping it; use {{{ifconfig}}} to list the network interfaces and their IP addresses. - 1. try and identify why it is in use. {{telnet <port>}} and pointing a web browser at it are both good tricks. + 1. try and identify why it is in use. {{{telnet <hostname> <port>}}} and pointing a web browser at it are both good tricks. - 1. If the port number is below 1024, the OS may be preventing your program from binding to a "trusted port" 1. change the configuration of one of the programs to listen on a different port.
