too many fetch-failures

[tran thien]

hi everyone,
i am using hadoop 0.17.1.
There are 2 node : one master(also slave) and one slave.
when i run example wordcount i have problem like this :

08/08/16 11:59:39 INFO mapred.JobClient:  map 100% reduce 22%
08/08/16 11:59:48 INFO mapred.JobClient:  map 100% reduce 23%
08/08/16 12:02:03 INFO mapred.JobClient: Task Id :
task_200808161130_0001_m_000007_0, Status : FAILED
Too many fetch-failures

I config hadoop-site.xml like this :

<?xml version="1.0"?>
<?xml-stylesheet type="text/xsl" href="configuration.xsl"?>

<!-- Put site-specific property overrides in this file. -->

<configuration>

<property>
  <name>fs.default.name</name>
  <value>hdfs://192.168.1.135:54310</value>
  <description>The name of the default file system.  A URI whose
  scheme and authority determine the FileSystem implementation.  The
  uri's scheme determines the config property (fs.SCHEME.impl) naming
  the FileSystem implementation class.  The uri's authority is used to
  determine the host, port, etc. for a filesystem.</description>
</property>
 
<property>
  <name>mapred.job.tracker</name>
  <value>192.168.1.135:54311</value>
  <description>The host and port that the MapReduce job tracker runs
  at.  If "local", then jobs are run in-process as a single map
  and reduce task.
  </description>
</property>
 
<property>
  <name>dfs.replication</name>
  <value>2</value>
  <description>Default block replication.
  The actual number of replications can be specified when the file is
created.
  The default is used if replication is not specified in create time.
  </description>
</property>

<property>
  <name>mapred.map.tasks</name>
  <value>11</value>
  <description>The default number of map tasks per job.  Typically set
  to a prime several times greater than number of available hosts.
  Ignored when mapred.job.tracker is "local".  
  </description>
</property>

<property>
  <name>mapred.reduce.tasks</name>
  <value>7</value>
  <description>The default number of reduce tasks per job.  Typically
set
  to a prime close to the number of available hosts.  Ignored when
  mapred.job.tracker is "local".
  </description>
</property>

<property>
  <name>mapred.tasktracker.map.tasks.maximum</name>
  <value>5</value>
  <description>The maximum number of map tasks that will be run
  simultaneously by a task tracker.
  </description>
</property>

<property>
  <name>mapred.tasktracker.reduce.tasks.maximum</name>
  <value>5</value>
  <description>The maximum number of reduce tasks that will be run
  simultaneously by a task tracker.
  </description>
</property>

</configuration>


I don't know why? Can you help me to resolve this problem?

Thanks for the help in advance,

Regards,
thientd