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MapReduce >> mail # user >> Do I need special permissions to write?


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Do I need special permissions to write?
When I execute the wordcount  example I get this error:

2013-09-29 01:20:47,557 WARN [main] org.apache.hadoop.mapred.Task: Failure asking whether task can commit: java.io.IOException: Failed on local exception: java.io.IOException: Response is null.; Host Details : local host is: "pc18.hadoopmrbftpython3.emulab-net.uky.emulab.net/128.163.143.158"; destination host is: "pc18.uky.emulab.net":51460;
at org.apache.hadoop.net.NetUtils.wrapException(NetUtils.java:761)
at org.apache.hadoop.ipc.Client.call(Client.java:1239)
at org.apache.hadoop.ipc.WritableRpcEngine$Invoker.invoke(WritableRpcEngine.java:231)
at $Proxy6.canCommit(Unknown Source)
at org.apache.hadoop.mapred.Task.commit(Task.java:1118)
at org.apache.hadoop.mapred.Task.done(Task.java:1003)
at org.apache.hadoop.mapred.ReduceTask.run(ReduceTask.java:414)
at org.apache.hadoop.mapred.YarnChild$2.run(YarnChild.java:158)
at java.security.AccessController.doPrivileged(Native Method)
at javax.security.auth.Subject.doAs(Subject.java:416)
at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1478)
at org.apache.hadoop.mapred.YarnChild.main(YarnChild.java:153)
Caused by: java.io.IOException: Response is null.
at org.apache.hadoop.ipc.Client$Connection.receiveResponse(Client.java:949)
at org.apache.hadoop.ipc.Client$Connection.run(Client.java:844)
Is this error because the user that launched the job don't have permission to write in the HDFS?
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Thanks,