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Date: Sun, 29 Sep 2013 02:27:33 +0100
From: xeon <xeonmailinglist@gmail.com>
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To: user@hadoop.apache.org
Subject: Do I need special permissions to write?
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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?


-- 
Thanks,


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<html>
  <head>

    <meta http-equiv="content-type" content="text/html; charset=ISO-8859-1">
  </head>
  <body bgcolor="#FFFFFF" text="#000000">
    When I execute the wordcount&nbsp; example I get this error:<br>
    <br>
    <meta http-equiv="content-type" content="text/html;
      charset=ISO-8859-1">
    <pre style="margin: 0px; border: 0px; color: rgb(34, 34, 34); font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-align: start; text-indent: 0px; text-transform: none; widows: 2; word-spacing: 0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; background-color: rgb(255, 255, 255); ">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? 
</pre>
    <br>
    <pre class="moz-signature" cols="72">-- 
Thanks,</pre>
  </body>
</html>

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