[MAPREDUCE-2456] Show the reducer taskid and map/reduce tasktrackers for "Failed fetch notification #_ for task attempt..." log messages

• Type: Improvement
• Status: Closed
• Priority: Trivial
• Resolution: Fixed
• Affects Version/s: 0.20.204.0
• Fix Version/s: 0.20.204.0, 0.23.0
• Component/s: jobtracker
• Hadoop Flags: Reviewed
• Assignee: Jeffrey Naisbitt
• Reporter: Jeffrey Naisbitt
• Created: 27/Apr/11 21:29
• Updated: 02/Sep/11 22:13
• Resolved: 10/May/11 20:19

Description

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
attempt_201011300729_189729_m_007458_0".

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