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From "Runping Qi (JIRA)" <j...@apache.org>
Subject [jira] Created: (HADOOP-3332) improving the logging during shuffling
Date Thu, 01 May 2008 01:34:55 GMT
improving the logging during shuffling
--------------------------------------

                 Key: HADOOP-3332
                 URL: https://issues.apache.org/jira/browse/HADOOP-3332
             Project: Hadoop Core
          Issue Type: Improvement
          Components: mapred
            Reporter: Runping Qi



Below is an excerpt from the log file of a reducer. 
A same set of of messages about fetching schedule is logged every second. 
Yet, the critical information --- which hosts were slow --- was not there. 

  
2008-05-01 00:33:13,215 INFO org.apache.hadoop.mapred.ReduceTask: task_200804302255_0002_r_000720_0
Need another 3 map output(s) where 1 is already in progress 
2008-05-01 00:33:14,216 INFO org.apache.hadoop.mapred.ReduceTask: task_200804302255_0002_r_000720_0:
Got 0 new map-outputs & 0 obsolete map-outputs from tasktracker and 0 map-outputs from
previous failures 
2008-05-01 00:33:14,216 INFO org.apache.hadoop.mapred.ReduceTask: task_200804302255_0002_r_000720_0
Got 2 known map output location(s); scheduling... 
2008-05-01 00:33:14,216 INFO org.apache.hadoop.mapred.ReduceTask: task_200804302255_0002_r_000720_0
Scheduled 0 of 2 known outputs (2 slow hosts and 0 dup hosts) 
2008-05-01 00:33:14,216 INFO org.apache.hadoop.mapred.ReduceTask: task_200804302255_0002_r_000720_0
Need another 3 map output(s) where 1 is already in progress 
2008-05-01 00:33:15,217 INFO org.apache.hadoop.mapred.ReduceTask: task_200804302255_0002_r_000720_0:
Got 0 new map-outputs & 0 obsolete map-outputs from tasktracker and 0 map-outputs from
previous failures 
2008-05-01 00:33:15,217 INFO org.apache.hadoop.mapred.ReduceTask: task_200804302255_0002_r_000720_0
Got 2 known map output location(s); scheduling... 
2008-05-01 00:33:15,217 INFO org.apache.hadoop.mapred.ReduceTask: task_200804302255_0002_r_000720_0
Scheduled 0 of 2 known outputs (2 slow hosts and 0 dup hosts) 
2008-05-01 00:33:15,217 INFO org.apache.hadoop.mapred.ReduceTask: task_200804302255_0002_r_000720_0
Need another 3 map output(s) where 1 is already in progress 
2008-05-01 00:33:16,218 INFO org.apache.hadoop.mapred.ReduceTask: task_200804302255_0002_r_000720_0:
Got 0 new map-outputs & 0 obsolete map-outputs from tasktracker and 0 map-outputs from
previous failures 


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