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There is rare happenings during map or reduce phase, but mostly in map phase, the Exception messages: java.lang.Throwable: Child Error at org.apache.hadoop.mapred.TaskRunner.run(TaskRunner.java:271) Caused by: java.io.IOException: Task process exit with nonzero status of 126. at org.apache.hadoop.mapred.TaskRunner.run(TaskRunner.java:258) and error logs are cleaned, so It's very hard to debug. but I compared DefaultTaskController.java with 0.22, they use "bash command" to start the job scritp, but 1.0.4 use "bash, "-c", command". I removed "-c", everything is ok, 126 error code never happen again. I read man document of bash, it indicates when fork a new thread with write command, another thread with "bash -c" also has a writable fd. so I think it could return 126 status occasionally. So, there is only one line fix for this issue.
java.io.IOException: Task process exit with nonzero status of 1.