In addition to the exception, the output files in create in DFS are
completely wrong.
(with -reducer NONE, the outputs of map tasks are supposed to be copied
to DFS output directory)
On Oct 26, 2006, at 1:35 PM, dhruba borthakur (JIRA) wrote:
Map-reduce task does not finish correctly when -reducer NONE is
specified
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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
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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