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From "Amareshwari Sriramadasu (JIRA)" <j...@apache.org>
Subject [jira] Resolved: (MAPREDUCE-570) Streaming job fails with with identity mapper class
Date Mon, 05 Jul 2010 05:33:50 GMT

     [ https://issues.apache.org/jira/browse/MAPREDUCE-570?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Amareshwari Sriramadasu resolved MAPREDUCE-570.
-----------------------------------------------

    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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