a problem in hadoop cluster:reduce task couldn't find map tasks' output.

[qiu tian <ti...@yahoo.com.cn>]

Hi everyone!
I tried hadoop cluster setup on 4 pcs. I ran into a
problem about hadoop-common. when I ran the command'bin/hadoop jar
hadoop-*-examples.jar wordcount input output', the map tasks could
complet quickly, but the reduce phase took very long to complet. I
think it's caused by the config, so I changed the hadoop-site.xml for
many times, which didn't work. Here are hadoop-site.xml:



namevaluedescriptionfs.default.namehdfs://192.*.*.*:9000
mapred.job.tracker
192.*.*.*:9001
hadoop.tmp.dir/home/*/hadoop/tmp




























here is another hadoop-site.xml:
namevaluedescriptionfs.default.namehdfs://192.*.*.*:9000
mapred.job.tracker
192.*.*.*:9001
hadoop.tmp.dir/home/*/hadoop/tmp
dfs.replication2

dfs.name.dir/home/*/hadoop/file/name
dfs.data.dir/home/*/hadoop/file/data
mapred.system.dir
/home/*/hadoop/file/mapred/system
mapred.local.dir/home/*/hadoop/file/mapred/local
mapred.temp.dir
/home/*/hadoop/file/mapred/tmp
mapred.tasktracker.map.tasks.maximum2
mapred.tasktracker.reduce.tasks.maximum
2

Both of them above couldn't work.
Here is a problem from a tasktracker:

2009-09-10 20:08:35,169 INFO org.apache.hadoop.mapred.TaskTracker: org.apache.hadoop.util.DiskChecker$DiskErrorException: Could not find taskTracker/jobcache/job_200909102001_0001/attempt_200909102001_0001_m_000005_0/output/file.out in any of the configured local directories


I  am looking forward to your reply! Thanks!

Yan


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