[MAPREDUCE-63] TaskTracker falls into an infinite loop.

• Type: Bug
• Status: Open
• Priority: Major
• Resolution: Unresolved
• Assignee: Arun Murthy
• Reporter: Konstantin Shvachko
• Created: 16/May/07 02:59
• Updated: 26/Jul/12 07:57

Description

All maps had been completed successfully. I had only one reduce task during which
TaskTracker infinitely outputs:

07/05/15 19:35:41 INFO mapred.TaskTracker: task_0001_r_000000_0 0.16666667% reduce > copy (4 of 8 at 0.00 MB/s) >
07/05/15 19:35:42 INFO mapred.TaskTracker: task_0001_r_000000_0 0.16666667% reduce > copy (4 of 8 at 0.00 MB/s) >
07/05/15 19:35:43 INFO mapred.TaskTracker: task_0001_r_000000_0 0.16666667% reduce > copy (4 of 8 at 0.00 MB/s) >
07/05/15 19:35:44 INFO mapred.TaskTracker: task_0001_r_000000_0 0.16666667% reduce > copy (4 of 8 at 0.00 MB/s) >
07/05/15 19:35:45 INFO mapred.TaskTracker: task_0001_r_000000_0 0.16666667% reduce > copy (4 of 8 at 0.00 MB/s) >

JobTracker does not log anything about task task_0001_r_000000_0 except for
07/05/15 19:49:01 INFO mapred.JobTracker: Adding task 'task_0001_r_000000_0' to tip tip_0001_r_000000, for tracker 'tracker_my-host.com:50050'

Issue Links

• duplicates: HADOOP-1862 reduces are getting stuck trying to find map outputs