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https://issues.apache.org/jira/browse/HADOOP-4987?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12661475#action_12661475
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Amareshwari Sriramadasu commented on HADOOP-4987:
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This task is a job cleanup task launched at the end of the job. It is
launched on the map slot of the tasktracker. See HADOOP-3150.
HADOOP-4421 looks at making the job cleanup and job setup tasks as first class
tasks.
> One more illegal map task been launched when the job almost complete
> --------------------------------------------------------------------
>
> Key: HADOOP-4987
> URL: https://issues.apache.org/jira/browse/HADOOP-4987
> Project: Hadoop Core
> Issue Type: Bug
> Components: mapred
> Affects Versions: 0.19.0
> Environment: hadoop 0.19.0
> Reporter: Tian Chao
> Attachments: hadoop-hdfs-jobtracker-vega2000.log
>
>
> When the job nearly complete, the JobTracker launched one more map task and
> quickly complete.
> The Last map task is useless and illegal actually. In the following examples,
> the job should have 101 map tasks and the taskID begin from
> "attempt_200901071109_0001_m_000000". So the TaskID
> "attempt_200901071109_0001_m_000101" is out of range.
> 2009-01-07 11:16:04,435 INFO org.apache.hadoop.mapred.JobTracker: Adding task
> 'attempt_200901071109_0001_m_000101_0' to tip
> task_200901071109_0001_m_000101, for tracker
> 'tracker_ict.vega2010.org:127.0.0.1/127.0.0.1:40668'
> 2009-01-07 11:16:05,230 INFO org.apache.hadoop.mapred.JobInProgress: Task
> 'attempt_200901071109_0001_m_000101_0' has completed
> task_200901071109_0001_m_000101 successfully.
> 2009-01-07 11:16:05,231 INFO org.apache.hadoop.mapred.JobInProgress: Job
> job_200901071109_0001 has completed successfully.
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