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The "ConnectionRefused" page has been changed by SteveLoughran: https://wiki.apache.org/hadoop/ConnectionRefused?action=diff&rev1=13&rev2=14 Comment: link to ambari port list If the application or cluster is not working, and this message appears in the log, then it is more serious. + The exception text declares both the hostname and the port to which the connection failed. The port can be used to identify the service. For example, port 9000 is the HDFS port. Consult the [[https://ambari.apache.org/1.2.5/installing-hadoop-using-ambari/content/reference_chap2.html|Ambari port reference]], and/or those of the supplier of your Hadoop management tools. + 1. Check the hostname the client using is correct. If it's in a Hadoop configuration option: examine it carefully, try doing an ping by hand. 1. Check the IP address the client is trying to talk to for the hostname is correct. + 1. Make sure the destination address in the exception isn't 0.0.0.0 -this means that you haven't actually configured the client with the real address for that service, and instead it is picking up the server-side property telling it to listen on every port for connections. - 1. Make sure the destination address in the exception isn't 0.0.0.0 -this means that you haven't actually configured the client with the real address for that. - service, and instead it is picking up the server-side property telling it to listen on every port for connections. 1. If the error message says the remote service is on "127.0.0.1" or "localhost" that means the configuration file is telling the client that the service is on the local server. If your client is trying to talk to a remote system, then your configuration is broken. 1. Check that there isn't an entry for your hostname mapped to 127.0.0.1 or 127.0.1.1 in /etc/hosts (Ubuntu is notorious for this). 1. Check the port the client is trying to talk to using matches that the server is offering a service on. --------------------------------------------------------------------- To unsubscribe, e-mail: [email protected] For additional commands, e-mail: [email protected]
