hadoop-hdfs-user mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From "Ramya S" <ram...@suntecgroup.com>
Subject Taktracker in namenode failure
Date Fri, 12 Jul 2013 09:16:21 GMT
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
Mime
View raw message