Too many fetch-failures issue
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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
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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