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.tracker192.*.*.*: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.maximum2 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