Hello,

On Fri, Mar 30, 2012 at 07:17:27PM +0200, Roberto Alonso wrote:
> <property>
> <name>mapred.system.dir</name>
> <value>/mapred/system</value>
> </property>
> 
> When I put and start the tasktracker:
> sudo service hadoop-0.20-tasktracker start
> 
> The log /usr/lib/hadoop-0.20/logs/hadoop-hadoop-tasktracker.log says the
> next:
> 
> ERROR org.apache.hadoop.mapred.TaskTracker: Can not start task tracker
> because java.lang.RuntimeException: Not a host:port pair: local
> 
> do you know whats happening??
> 
I am just guessing, but maybe you don't have set the information about
the job tracker?

<property>
   <name>mapred.job.tracker</name>
   <value>localhost:8021</value>
</property>

Cheers,
Arvid

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