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From Devaraj K <devara...@huawei.com>
Subject RE: type mismatch error
Date Tue, 12 Jul 2011 11:37:25 GMT
Hi Teng,

 

As per the exception stack trace, it is not invoking the TaskMapper.map()
method and it is invoking the default Mapper.map() method. Can you recheck
the configurations and job code whether it is properly copied or not?

 

Devaraj K 

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From: Teng, James [mailto:xteng@ebay.com] 
Sent: Tuesday, July 12, 2011 12:16 PM
To: common-user@hadoop.apache.org
Subject: FW: type mismatch error

 

hi, all.

I am a new hadoop beginner, I try to construct a map and reduce task to run,
however encountered an exception while continue going further.

Exception:

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

     at
org.apache.hadoop.mapred.MapTask$MapOutputBuffer.collect(MapTask.java:845)

     at
org.apache.hadoop.mapred.MapTask$NewOutputCollector.write(MapTask.java:541)

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

     at org.apache.hadoop.mapreduce.Mapper.map(Mapper.java:124)

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

     at org.apache.hadoop.mapred.MapTask.runNewMapper(MapTask.java:621)

     at org.apache.hadoop.mapred.MapTask.run(MapTask.java:305)

     at
org.apache.hadoop.mapred.LocalJobRunner$Job.run(LocalJobRunner.java:177)

Mapper:

 

 

Any help is greatly appreciated!

Thanks in advance.

 

James, Teng (Teng Linxiao)

eRL,   CDC,    eBay,    Shanghai

Extension:        86-21-28913530

MSN:      <mailto:tenglinxiao@hotmail.com> tenglinxiao@hotmail.com

Skype:                James,Teng

Email:            xteng@ebay.com




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