Details
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Bug
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Status: Closed
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Blocker
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Resolution: Fixed
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0.15.0
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None
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None
Description
A job with 4000 maps on a 1400 node cluster (3 tasks per node allowed) had a lot (150) of 'Too many fetch-failures' map failures.
From the jobtracker log it looks as if it got confused which tasktracker actually ran the task:
(In the following log output, I replaced the corresponding tasktracker nodes with **node_assigned** and **node_fetch_attempt* and they are different)
grep task_200709170247_0018_m_000009_0 hadoop-xxx-jobtracker-node.log.2007-09-19:
2007-09-19 15:52:26,907 INFO org.apache.hadoop.mapred.JobTracker: Adding task 'task_200709170247_0018_m_000009_0' to tip tip_200709170247_0018_m_000009, for tracker 'tracker_**node_assigned_**:/127.0.0.1:54523'
2007-09-19 15:58:03,111 INFO org.apache.hadoop.mapred.TaskRunner: Saved output of task 'task_200709170247_0018_m_000009_0' to hdfs://location
2007-09-19 15:58:03,111 INFO org.apache.hadoop.mapred.JobInProgress: Task 'task_200709170247_0018_m_000009_0' has completed tip_200709170247_0018_m_000009 successfully.
2007-09-19 15:58:03,111 INFO org.apache.hadoop.mapred.TaskInProgress: Task 'task_200709170247_0018_m_000009_0' has completed succesfully
2007-09-19 16:21:07,825 INFO org.apache.hadoop.mapred.JobInProgress: Failed fetch notification #1 for task task_200709170247_0018_m_000009_0
2007-09-19 16:23:23,483 INFO org.apache.hadoop.mapred.JobInProgress: Failed fetch notification #2 for task task_200709170247_0018_m_000009_0
2007-09-19 16:25:07,182 INFO org.apache.hadoop.mapred.JobInProgress: Failed fetch notification #3 for task task_200709170247_0018_m_000009_0
2007-09-19 16:25:07,182 INFO org.apache.hadoop.mapred.JobInProgress: Too many fetch-failures for output of task: task_200709170247_0018_m_000009_0 ... killing it
2007-09-19 16:25:07,182 INFO org.apache.hadoop.mapred.TaskInProgress: Error from task_200709170247_0018_m_000009_0: Too many fetch-failures
2007-09-19 16:25:07,182 INFO org.apache.hadoop.mapred.TaskInProgress: Task 'task_200709170247_0018_m_000009_0' has been lost.
2007-09-19 16:25:07,184 INFO org.apache.hadoop.mapred.JobTracker: Removed completed task 'task_200709170247_0018_m_000009_0' from 'tracker_**node_fetch_attempt**:/127.0.0.1:48818'
2007-09-19 21:40:00,235 INFO org.apache.hadoop.mapred.JobTracker: Removed completed task 'task_200709170247_0018_m_000009_0' from 'tracker_**node_fetch_attempt**:/127.0.0.1:48818'