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The "UnknownHost" page has been changed by SteveLoughran: https://wiki.apache.org/hadoop/UnknownHost?action=diff&rev1=3&rev2=4 Comment: add footnote: no JIRAs here 1. Restart the servers to see if that makes it go away. 1. Reboot the network switches. - Remember, unless the route cause has been identified, the problem may return. + Unless the route cause has been identified, the problem may return. + Finally, because this is a configuration problem, filing bug reports is not going to help. They will only be closed as [[http://wiki.apache.org/hadoop/InvalidJiraIssues|Invalid Issues]] +
