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https://issues.apache.org/jira/browse/HADOOP-10558?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14056007#comment-14056007
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Steve Loughran commented on HADOOP-10558:
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I'm afraid both of you appear to have some network configuration problem.
All we can do is say "follow the wiki link and try their suggestions". There
may be some other cause in your network -the list isn't exhaustive...if you do
find a new cause then add it to the list.
I'm going to have to close this as invalid as it works for everyone else, it's
not a bug in Hadoop, it's something wrong with your network. Sorry
https://wiki.apache.org/hadoop/InvalidJiraIssues
> java.net.UnknownHostException: Invalid host name: local host is: (unknown)
> --------------------------------------------------------------------------
>
> Key: HADOOP-10558
> URL: https://issues.apache.org/jira/browse/HADOOP-10558
> Project: Hadoop Common
> Issue Type: Bug
> Environment: two node cluster
> ubuntu 12.04 LTS in both
> Java version "1.7.0_25"
> node 1: core i5 4 GB RAM
> node 2: core i3 4 GB RAM
> Reporter: Sami Abobala
> Labels: debian, hadoop, hadoop-3.0.0-SNAPSHOT, mapreduce, ubuntu
>
> I had this exception every time i try to run map-red job, I went to
> http://wiki.apache.org/hadoop/UnknownHost
> and tried every possible solution and still have the same result
> Task Id : attempt_1398945803120_0001_m_000004_0, Status : FAILED
> Container launch failed for container_1398945803120_0001_01_000006 :
> java.lang.reflect.UndeclaredThrowableException
> .
> .
> Caused by: com.google.protobuf.ServiceException:
> java.net.UnknownHostException: Invalid host name: local host is: (unknown);
> destination host is: ""fatima-HP-ProBook-4520s":8042;
> java.net.UnknownHostException; For more details see:
> http://wiki.apache.org/hadoop/UnknownHost
> .
> .
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