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From "Richard Yang" <richardy...@richardyang.net>
Subject RE: System is hanging while executing bin/start-all.sh and bin/stop-all.sh
Date Fri, 23 Mar 2007 15:29:10 GMT
Hello,

It is nice to know the issue occurring consistently. 
According to the log file, the namenode/master (M) has problem reaching to
datanode/slave (S) auriga.  Does ssh from M to S work? i.e. does
M$> ssh jaya@auriga
directly return a command prompt on S as user jaya? If not, at least, we
know there is some issue on network side.  One like Arun indicating, dns
service is not functioning normally.
One simple (coward) solution is to use only ip addresses.  This way could
simplify the setup configurations.


Best Regards
 
Richard Yang
richardyang@richardyang.net
kusanagiyang@gmail.com
 
 

-----Original Message-----
From: Arun C Murthy [mailto:arunc@yahoo-inc.com] 
Sent: Friday, March 23, 2007 3:33 AM
To: hadoop-user@lucene.apache.org
Subject: Re: System is hanging while executing bin/start-all.sh and
bin/stop-all.sh

jaylac wrote:
> hi richard
> 
> My system is hanging always.. this is not a rare event for me.
> I cant trace out what i the problem.... please help me...
> 
> Following are log files...
> 
> Here auriga is the name of thre slave node.
> 
> In the slave node
> 
> 2007-03-23 14:37:56,108 ERROR org.apache.hadoop.mapred.TaskTracker: Can
not
> start task trackerbecause java.net.UnknownHostException: auriga: auriga
>         at java.net.InetAddress.getLocalHost(InetAddress.java:1315)
>         at org.apache.hadoop.net.DNS.getDefaultHost(DNS.java:169)
>
============================================================================
=
> 
> hadoop-jaya-datanode-auriga.log file
> ---------------------------------------------------------
> 2007-03-23 14:37:54,248 ERROR org.apache.hadoop.dfs.DataNode:
> java.net.UnknownHostException: auriga: auriga
>         at java.net.InetAddress.getLocalHost(InetAddress.java:1315)
>         at org.apache.hadoop.dfs.DataNode.<init>(DataNode.java:178)

It looks like a dns issue; please check with your sysadmin.

What does
$ host auriga
say?

Arun



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