Details
-
Improvement
-
Status: Closed
-
Blocker
-
Resolution: Fixed
-
0.18.0
-
None
-
None
-
Reviewed
Description
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