Even i have been noticing this error. But the job did not fail in my case. i see that only around 1 or 2 mappers out of 20 or so are failing after waiting for 1800 secs. The resource manager attempts the failed mappers again and they run to success. How can i understand why those 1 or 2 mappers are failing? i could only see this message on the log java.lang.Exception: Container is not yet running. Current state is NEW ... View more