Server error after someone change config

[#1]

What can I check to resolve this issue?  Had someone changing stuff and have no idea what they did to kill my hadoop cloudera.

15/04/13 16:28:18 INFO mapred.FileInputFormat: Total input paths to process : 10
15/04/13 16:28:18 INFO mapred.JobClient: Running job: job_201504131620_0001
15/04/13 16:28:19 INFO mapred.JobClient: map 0% reduce 0%
15/04/13 16:28:22 INFO mapred.JobClient: Task Id : attempt_201504131620_0001_m_000011_0, Status : FAILED
java.lang.Throwable: Child Error
at org.apache.hadoop.mapred.TaskRunner.run(TaskRunner.java:250)
Caused by: java.io.IOException: Task process exit with nonzero status of 2.
at org.apache.hadoop.mapred.TaskRunner.run(TaskRunner.java:237)

[#2]

Have you had any luck with this?

[#3]

If there was some changes to the MapReduce or Yarn service, you can see those configuration changes by hitting the "History and Rollback" button on the configuration page for the service.  That will display the most recent changes, and you can review those and rollback if needed.

[#4 · Accepted solution]

I just did a roll back which resolved the issue. We have been testing apache hadoop as well so that's why I was delayed to answer.

Thanks