That number is around 40K (I think). I am not sure if you have certain configurations to cleanup user task logs periodically. We have solved this problem in MAPREDUCE-2415 which part of 0.20.204.
But you cleanup the task logs periodically, you will not run into this problem. -Bharath ________________________________ From: Michael Hu <mesolit...@gmail.com> To: common-dev@hadoop.apache.org Sent: Sunday, July 10, 2011 8:14 PM Subject: "java.lang.Throwable: Child Error " And " Task process exit with nonzero status of 1." Hi,all, The hadoop is set up. Whenever I run a job, I always got the same error. Error is: micah29@nc2:/usr/local/hadoop/hadoop$ ./bin/hadoop jar hadoop-mapred-examples-0.21.0.jar wordcount test testout *11/07/11 10:48:59 INFO mapreduce.Job: Running job: job_201107111031_0003 11/07/11 10:49:00 INFO mapreduce.Job: map 0% reduce 0% 11/07/11 10:49:11 INFO mapreduce.Job: Task Id : attempt_201107111031_0003_m_000002_0, Status : FAILED java.lang.Throwable: Child Error at org.apache.hadoop.mapred.TaskRunner.run(TaskRunner.java:249) Caused by: java.io.IOException: Task process exit with nonzero status of 1. at org.apache.hadoop.mapred.TaskRunner.run(TaskRunner.java:236) 11/07/11 10:49:11 WARN mapreduce.Job: Error reading task outputhttp://nc2:50060/tasklog?plaintext=true&attemptid=attempt_201107111031_0003_m_000002_0&filter=stdout 11/07/11 10:49:11 WARN mapreduce.Job: Error reading task outputhttp://nc2:50060/tasklog?plaintext=true&attemptid=attempt_201107111031_0003_m_000002_0&filter=stderr * I google the " Task process exit with nonzero status of 1." They say 'it's an OS limit on the number of sub-directories that can be related in another directory.' But I can create any sub-directories related in another directory. Please, could anybody help me to solve this problem? Thanks -- Yours sincerely Hu Shengqiu
