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From Apache Wiki <wikidi...@apache.org>
Subject [Hadoop Wiki] Update of "BindException" by SteveLoughran
Date Mon, 27 Jun 2011 12:09:01 GMT
Dear Wiki user,

You have subscribed to a wiki page or wiki category on "Hadoop Wiki" for change notification.

The "BindException" page has been changed by SteveLoughran:
http://wiki.apache.org/hadoop/BindException

Comment:
entry on bind exceptions

New page:
= 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.

How to track down the problem
1. identify which port the program is trying to bind to
1. use {{{netstat -a -t --numeric-ports -p}}} to list the ports that are in use by number
and process.
1. identify the port that is in use and the program that is in use
1. try and identify why it is in use. Telnet <port> and pointing a web browser at it
are both good tricks.
1. change the configuration of one of the programs to listen on a different port. 

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