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

Hadoop Map/Reduce

TaskTracker falls into an infinite loop.

Created: 16/May/07 02:59 AM Updated: 20/Jun/09 07:50 AM

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Component/s:

None

Affects Version/s:

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Fix Version/s:

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Time Tracking:

Not Specified

File Attachments:

File Name	Date Attached	Attached By	Size
DataNode1.log	2007-05-25 02:03 AM	Konstantin Shvachko	6 kB
DataNode2.log	2007-05-25 02:03 AM	Konstantin Shvachko	7 kB
hadoop-1374-yunhong.tar.gz	2008-01-25 12:43 AM	Yunhong Gu	4 kB
JobTracker.log	2007-05-25 02:02 AM	Konstantin Shvachko	11 kB
NameNode.log	2007-05-25 02:03 AM	Konstantin Shvachko	4 kB
TaskTracker1.log	2007-05-25 02:02 AM	Konstantin Shvachko	14 kB
TaskTracker2.log	2007-05-25 02:02 AM	Konstantin Shvachko	9 kB
TestDFSIO.log	2007-05-25 02:11 AM		0.9 kB

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Duplicate

This issue duplicates:

~~HADOOP-1862~~ reduces are getting stuck trying to find map outputs

Description

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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'

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