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https://issues.apache.org/jira/browse/HADOOP-1930?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12529519
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Arun C Murthy commented on HADOOP-1930:
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So, thankfully, this just looks like a bug in the log-message. I'll rustle up a
patch to fix this one...
> Too many fetch-failures issue
> -----------------------------
>
> Key: HADOOP-1930
> URL: https://issues.apache.org/jira/browse/HADOOP-1930
> Project: Hadoop
> Issue Type: Bug
> Components: mapred
> Affects Versions: 0.15.0
> Reporter: Christian Kunz
> Assignee: Arun C Murthy
> Priority: Blocker
>
> 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'
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