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https://issues.apache.org/jira/browse/HADOOP-1281?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12539748
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lohit vijayarenu commented on HADOOP-1281:
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We hit this bug today.
Below is the log for 2 attempts for same task
<log>
Task Attempts Status Progress Start Time Finish Time Errors Task Logs Counters 
task_200711022153_0001_m_001548_0 SUCCEEDED 100.00% 2-Nov-2007 22:00:59 
2-Nov-2007 22:05:50 (4mins, 51sec)  
task_200711022153_0001_m_001548_1  KILLED 84.44% 2-Nov-2007 22:02:17 2-Nov-2007 
22:26:02 (23mins, 45sec)  
</log>

If you look at the time each of the attempt took, after the first attempt 
finished in ~4mins, the second attempt should have been killed. But it went 
ahead and was running for ~23min. When we took a look at the logs, we saw that, 
the attempt was issued a kill signal after the whole job was completed. 
The JobTracker did not send Kill signal to this task attempt (Or may be nothing 
was logged). 



> Speculative map tasks aren't getting killed although the TIP completed
> ----------------------------------------------------------------------
>
>                 Key: HADOOP-1281
>                 URL: https://issues.apache.org/jira/browse/HADOOP-1281
>             Project: Hadoop
>          Issue Type: Bug
>          Components: mapred
>            Reporter: Arun C Murthy
>            Assignee: Arun C Murthy
>
> The speculative map tasks run to completion although the TIP succeeded since 
> the other task completed elsewhere.

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