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From "Jeffrey Naisbitt (JIRA)" <j...@apache.org>
Subject [jira] [Created] (MAPREDUCE-2456) Show the reducer taskid and map/reduce tasktrackers for "Failed fetch notification #_ for task attempt..." log messages
Date Wed, 27 Apr 2011 21:31:03 GMT
Show the reducer taskid and map/reduce tasktrackers for "Failed fetch notification #_ for task
attempt..." log messages
-----------------------------------------------------------------------------------------------------------------------

                 Key: MAPREDUCE-2456
                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-2456
             Project: Hadoop Map/Reduce
          Issue Type: Improvement
    Affects Versions: 0.20.204.0
            Reporter: Jeffrey Naisbitt
            Assignee: Jeffrey Naisbitt
            Priority: Trivial
             Fix For: 0.20.205.0


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


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