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Posted to common-dev@hadoop.apache.org by "dhruba borthakur (JIRA)" <ji...@apache.org> on 2006/11/08 22:44:54 UTC
[jira] Reopened: (HADOOP-645) Map-reduce task does not finish
correctly when -reducer NONE is specified
[ 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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