I have been getting error in my output saying error reading task
outputhttp - I read that this may be a logging issue but
do not know how or where to look for problems - when I go to the task
tracker and click on the attempy is says ChildError
and when I click on the output of the task it says not available. We
have had issues with log directories being full but i need to know
1) Do I look on the jobtracker (singleton) or on each node - if on
each node where and how do I fix the issue -
Sometimes restarting the cluster helps but I wand a mush better
understanding of what is going on
11/10/26 15:42:30 WARN mapred.JobClient: Error reading task outputhttp://
glados6.systemsbiology.net:50060/tasklog?plaintext=true&taskid=attempt_201110261134_0009_m_000001_2&filter=stdout
11/10/26 15:42:30 WARN mapred.JobClient: Error reading task outputhttp://
glados6.systemsbiology.net:50060/tasklog?plaintext=true&taskid=attempt_201110261134_0009_m_000001_2&filter=stderr
11/10/26 15:42:36 INFO mapred.JobClient: Task Id :
attempt_201110261134_0009_r_000080_2, Status : FAILED
java.lang.Throwable: Child Error
java.lang.Throwable: Child Error
at org.apache.hadoop.mapred.TaskRunner.run(TaskRunner.java:471)
Caused by: java.io.IOException: Task process exit with nonzero status of 255.
at org.apache.hadoop.mapred.TaskRunner.run(TaskRunner.java:458)
Failed to retrieve stdout log for task: attempt_201110271342_0044_r_000000_0
--
Steven M. Lewis PhD
4221 105th Ave NE
Kirkland, WA 98033
206-384-1340 (cell)
Skype lordjoe_com
