Hi:
I have met the similar problem with you. Finally, I found that this
problem was caused by the hostname resolution because hadoop use hostname to
access other nodes.
To fix this, try open your jobtracker log file( It often resides in
$HADOOP_HOME/logs/hadoop-xxxx-jobtracker-xxxx.log ) to see if there is a
error:
"FATAL org.apache.hadoop.mapred.JobTracker: java.net.UnknownHostException:
Invalid hostname for server: local"
If, it is, adding ip-hostname pairs to /etc/hosts files on all of you
nodes may fix this problem.
Good luck and best regards.
Mafish
--
[EMAIL PROTECTED]
Institute of Computing Technology, Chinese Academy of Sciences, Beijing.
