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https://issues.apache.org/jira/browse/MAPREDUCE-570?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Amareshwari Sriramadasu resolved MAPREDUCE-570.
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Resolution: Duplicate
Fixed by MAPREDUCE-1888
> Streaming job fails with with identity mapper class
> ---------------------------------------------------
>
> Key: MAPREDUCE-570
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-570
> Project: Hadoop Map/Reduce
> Issue Type: Bug
> Components: contrib/streaming
> Reporter: Suhas Gogate
> Priority: Minor
>
> Streaming job command:
> $HADOOP_HOME/bin/hadoop jar $HADOOP_HOME/hadoop-streaming.jar \
> -input myInputDirs \
> -output myOutputDir \
> -mapper org.apache.hadoop.mapred.lib.IdentityMapper \
> -reducer org.apache.hadoop.mapred.lib.IndentityReducer
> Error in job tracker hadoop.log:
> 2008-11-24 22:18:12,637 INFO org.apache.hadoop.mapred.TaskInProgress: Error
> from attempt_200811242217_0001_m_000001_3: java.io.IOException: Type mismatch
> in key from map: expected org.apache.hadoop.io.Text, recieved
> org.apache.hadoop.io.LongWritable^D
> at
> org.apache.hadoop.mapred.MapTask$MapOutputBuffer.collect(MapTask.java:415)^D
> at
> org.apache.hadoop.mapred.lib.IdentityMapper.map(IdentityMapper.java:37)^D
> at org.apache.hadoop.mapred.MapRunner.run(MapRunner.java:47)^D
> at org.apache.hadoop.mapred.MapTask.run(MapTask.java:227)^D
> at
> org.apache.hadoop.mapred.TaskTracker$Child.main(TaskTracker.java:2207)^D
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