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 ---------------------------------------------------------------------------- --------------------------------------------------------- This e-mail and its attachments contain confidential information from HUAWEI, which is intended only for the person or entity whose address is listed above. Any use of the information contained herein in any way (including, but not limited to, total or partial disclosure, reproduction, or dissemination) by persons other than the intended recipient(s) is prohibited. If you receive this e-mail in error, please notify the sender by phone or email immediately and delete it!ss _____ From: Teng, James [mailto:xt...@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:tenglinx...@hotmail.com> tenglinx...@hotmail.com Skype: James,Teng Email: xt...@ebay.com
