This jira is to provide more useful log information for debugging the "Too many fetch-failures" error.
Looking at the JobTracker node, we see messages like this:
"2010-12-14 00:00:06,911 INFO org.apache.hadoop.mapred.JobInProgress: Failed fetch notification #8 for task
I would be useful to see which reducer is reporting the error here.
So, I propose we add the following to these log messages:
1. reduce task ID
2. TaskTracker nodenames for both the mapper and the reducer