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From: Tejas Lagvankar <tej2@umbc.edu>
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Subject: 0.20.1 Cluster Setup Problem
Date: Tue, 13 Oct 2009 10:17:14 -0400
Message-Id: <8E86E890-7D86-4CB0-A525-5CF056265717@umbc.edu>
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Hi,


We are trying to set up a cluster (starting with 2 machines) using the  
new 0.20.1 version.

On the master machine, just after the server starts, the name node  
dies off with the following exception:

2009-10-13 01:22:24,740 ERROR  
org.apache.hadoop.hdfs.server.namenode.NameNode: java.io.IOException:  
Incomplete HDFS URI, no host: hdfs://master_hadoop
         at org.apache.hadoop.hdfs.DistributedFileSystem.initialize 
(DistributedFileSystem.java:78)
         at org.apache.hadoop.fs.FileSystem.createFileSystem 
(FileSystem.java:1373)
         at org.apache.hadoop.fs.FileSystem.access$200(FileSystem.java: 
66)
         at org.apache.hadoop.fs.FileSystem$Cache.get(FileSystem.java: 
1385)
         at org.apache.hadoop.fs.FileSystem.get(FileSystem.java:191)
         at org.apache.hadoop.fs.FileSystem.get(FileSystem.java:95)
         at org.apache.hadoop.fs.Trash.<init>(Trash.java:62)
         at  
org.apache.hadoop.hdfs.server.namenode.NameNode.startTrashEmptier 
(NameNode.java:208)
         at org.apache.hadoop.hdfs.server.namenode.NameNode.initialize 
(NameNode.java:204)
         at org.apache.hadoop.hdfs.server.namenode.NameNode.<init> 
(NameNode.java:279)
         at  
org.apache.hadoop.hdfs.server.namenode.NameNode.createNameNode 
(NameNode.java:956)
         at org.apache.hadoop.hdfs.server.namenode.NameNode.main 
(NameNode.java:965)

Can anyone help ?  Also can anyone send across example configuration  
files for 0.20.1 if they are different than we are using ?

The detail log file is attached along with.


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The configuration files are as follows:

MASTER CONFIG
------ conf/masters -------
master_hadoop

------ conf/slaves -------
master_hadoop
slave_hadoop

------ core-site.xml -------
<configuration>

<property>
   <name>fs.default.name</name>
   <value>hdfs://master_hadoop</value>
</property>

<property>
   <name>hadoop.tmp.dir</name>
   <value>/opt/hadoop-0.20.1/tmp</value>
</property>

------ hdfs-site.xml -------
<property>
   <name>dfs.replication</name>
   <value>2</value>
</property>


------ mapred-site.xml -------
<property>
   <name>mapred.job.tracker</name>
   <value>tejas_hadoop:9001</value>
</property>





SLAVE CONFIG
------ core-site.xml -------
<property>
   <name>hadoop.tmp.dir</name>
   <value>/opt/hadoop-0.20.1/tmp/</value>
</property>


<property>
   <name>fs.default.name</name>
   <value>hdfs://master_hadoop</value>
</property>


------ hdfs-site.xml -------
<property>
   <name>dfs.replication</name>
   <value>2</value>
</property>

------ mapred-site.xml -------
<property>
   <name>mapred.job.tracker</name>
   <value>tejas_hadoop:9001</value>
</property>



Regards,

Tejas Lagvankar
meettejas@umbc.edu
www.umbc.edu/~tej2




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