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From Harsh J <ha...@cloudera.com>
Subject Re: type mismatch error
Date Tue, 12 Jul 2011 12:59:34 GMT
Yep, best to annotate your code with the @Override annotation so that
you can detect troubles like these easily.

On Tue, Jul 12, 2011 at 5:07 PM, Devaraj K <devaraj.k@huawei.com> wrote:
> 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
>
>
>
>



-- 
Harsh J

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