[ 
https://issues.apache.org/jira/browse/HADOOP-10558?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14055842#comment-14055842
 ] 

Lance Ying LI commented on HADOOP-10558:
----------------------------------------

[root@debian0][140709125041][/opt/hadoop-3.0.0-SNAPSHOT/sbin]cat /etc/hosts
202.45.128.160  debian0
202.45.128.161  debian1
202.45.128.162  debian2
202.45.128.163  debian3
202.45.128.164  debian4

202.45.128.169  controller
202.45.128.168  switch

202.45.128.171  d1
202.45.128.172  d2
202.45.128.173  d3
202.45.128.174  d4


202.45.128.160 localhost

> 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: hadoop, 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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