I am trying to setup a small hadoop cluster , everything was ok before I moved from single node cluster to two-node cluster. I followed the article http://www.michael-noll.com/wiki/Running_Hadoop_On_Ubuntu_Linux_(Multi-Node_Cluster)<http://www.michael-noll.com/wiki/Running_Hadoop_On_Ubuntu_Linux_%28Multi-Node_Cluster%29>to config master and slaves.However, when I tried to run the example wordcount map-reduce application , the reduce task got stuck in 19% for a log time . Then I got a notice:"INFO mapred.JobClient: TaskId : attempt_200904072219_0001_m_000002_0, Status : FAILED too many fetch errors" and an error message : Error reading task outputslave.
All map tasks in both task nodes had been finished which could be verified in task tracker pages. Both nodes work well in single node mode . And the Hadoop file system seems to be healthy in multi-node mode. Can anyone help me with this issue? Have already got entangled in this issue for a long time ... Thanks very much!
