Hey All, I am running Hadoop 0.19.1. One of my Mapper tasks was failing and the problem that was reported was:
Task process exit with nonzero status of 1... Looking through the mailing list archives, I got the impression that this was only caused by a JVM crash. After much hair pulling, I figured out that the problem was actually caused by an exception thrown in my Mapper's close() method. I was catching the initial exception, printing a message and a stack trace, and rethrowing the exception as a runtime exception. But my printouts never showed up. Also, when the task was restarted after the initial failure, the task would always fail again but in seemingly random places. Sometimes not printing anything at all in the logs. I'm not sure if throwing runtime exceptions in the close() method is a discouraged practice for Hadoop Mappers. In any case, I thought I'd report my experience in case it helps anyone else. g00dn3ss
