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From Devaraj k <devara...@huawei.com>
Subject RE: Taktracker in namenode failure
Date Fri, 12 Jul 2013 09:34:16 GMT
Could you tell, what is the Map Output Value class you are configuring while submitting Job
and what is the type of the value writing from the Mapper. If both of these mismatches then
it will trow the below error.

Thanks
Devaraj k

From: Ramya S [mailto:ramyas@suntecgroup.com]
Sent: 12 July 2013 14:46
To: user@hadoop.apache.org
Subject: Taktracker in namenode failure

Hi,

Why only tasktracker in namenode faill during  job execution with error.
I have attached the snapshot of error screen with this mail

java.io.IOException: Type mismatch in value from map: expected org.apache.hadoop.io.Text,
recieved org.apache.hadoop.io.IntWritable

        at org.apache.hadoop.mapred.MapTask$MapOutputBuffer.collect(MapTask.java:1019)

        at org.apache.hadoop.mapred.MapTask$NewOutputCollector.write(MapTask.java:691)

        at org.apache.hadoop.mapreduce.TaskInputOutputContext.write(TaskInputOutputContext.java:80)

        at WordCount$TokenizerMapper.map(WordCount.java:30)

        at WordCount$TokenizerMapper.map(WordCount.java:19)

        at org.apache.hadoop.mapreduce.Mapper.run(Mapper.java:144)

        at org.apache.hadoop.mapred.MapTask.runNewMapper(MapTask.java:764)

        at org.apache.hadoop.mapred.MapTask.run(MapTask.java:370)

        at org.apache.hadoop.mapred.Child$4.run(Child.java:255)

        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:1121)

        at org.apache.hadoop.mapred.Child.main(Child.java:249)



but  this same task is reassigned to another tasktracker and getting executed. why?


Best Regards,
Ramya
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