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From "Amareshwari Sriramadasu (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-4987) One more illegal map task been launched when the job almost complete
Date Wed, 07 Jan 2009 07:36:44 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-4987?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12661475#action_12661475
] 

Amareshwari Sriramadasu commented on HADOOP-4987:
-------------------------------------------------

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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