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From "eric baldeschwieler (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-645) Map-reduce task does not finish correctly when -reducer NONE is specified
Date Fri, 27 Oct 2006 20:55:18 GMT
    [ http://issues.apache.org/jira/browse/HADOOP-645?page=comments#action_12445271 ] 
eric baldeschwieler commented on HADOOP-645:

Is this a streaming specific discussion, or does general map-reduce really imply that map
outputs go directly to HDFS when no reducers are run?  I'm not sure that is a viable scalable
behavior.  This may simply create way too many outputs and kill the FS.

Do we believe this is the current behavior or an ask for an extension?

> Map-reduce task does not finish correctly when -reducer NONE is specified
> -------------------------------------------------------------------------
>                 Key: HADOOP-645
>                 URL: http://issues.apache.org/jira/browse/HADOOP-645
>             Project: Hadoop
>          Issue Type: Bug
>          Components: contrib/streaming
>    Affects Versions: 0.7.2
>            Reporter: dhruba borthakur
>         Assigned To: dhruba borthakur
> Map-reduce task does not finish correctly when -reducer NONE is specified, The NONE option
means that the reducer should not be generating any output. Using this option causes an exception
in the task tracker:
> java.lang.IllegalArgumentException: URI is not hierarchical
> TaskRunner: at java.io.File.<init>(File.java:335)
> TaskRunner: at org.apache.hadoop.streaming.PipeMapRed.mapRedFinished(PipeMapRed.java:583)
> TaskRunner: at org.apache.hadoop.streaming.PipeMapper.close(PipeMapper.java:96)
> TaskRunner: at org.apache.hadoop.mapred.MapRunner.run(MapRunner.java:49)
> TaskRunner: at org.apache.hadoop.mapred.MapTask.run(MapTask.java:213)
> TaskRunner: at org.apache.hadoop.mapred.TaskTracker$Child.main(TaskTracker.java:1240)
> TaskRunner: sideEffectURI_ file:output length 11

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