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From "dhruba borthakur (JIRA)" <j...@apache.org>
Subject [jira] Reopened: (HADOOP-645) Map-reduce task does not finish correctly when -reducer NONE is specified
Date Wed, 08 Nov 2006 21:44:54 GMT
     [ http://issues.apache.org/jira/browse/HADOOP-645?page=all ]

dhruba borthakur reopened HADOOP-645:

This issue is not completely fixed. My fix improves the situation but does not solve all of
the issues reported:

it is completely broken --
(a) the task fails       ---  THIS PART IS FIXED BY MY PREVIOUS PATCH
(b) a file is create for the output instead of a directory.
(c) there is no way to understand what is going on from the client output

I can produce an example for you, if you like -- but the behavior is consistent, so $HSTREAM
-mapper /bin/cat -reducer NONE should show the problem

> 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
>             Fix For: 0.9.0
>         Attachments: reducernone.patch
> 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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