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https://issues.apache.org/jira/browse/HADOOP-5130?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12667619#action_12667619
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Amareshwari Sriramadasu commented on HADOOP-5130:
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I also saw this behavior many times.
And there are cases that these tasks got killed for not reporting progress for
10 mins.
> TaskTracker seems to hold onto the assigned task for a long while before
> launching it
> -------------------------------------------------------------------------------------
>
> Key: HADOOP-5130
> URL: https://issues.apache.org/jira/browse/HADOOP-5130
> Project: Hadoop Core
> Issue Type: Bug
> Components: mapred
> Affects Versions: 0.20.0
> Reporter: Arun C Murthy
> Priority: Critical
>
> I saw atleast a couple of instances where the task assigned to the
> TaskTracker is launched several minutes after the receipt of the
> LaunchTaskAction:
> {noformat}
> 2009-01-27 13:55:53,402 INFO org.apache.hadoop.mapred.TaskTracker:
> LaunchTaskAction (registerTask): attempt_200901270818_0006_m_000602_0
> 2009-01-27 13:55:55,129 INFO org.apache.hadoop.mapred.TaskTracker: Trying to
> launch : attempt_200901270818_0006_m_000602_0
> 2009-01-27 13:55:55,129 INFO org.apache.hadoop.mapred.TaskTracker: In
> TaskLauncher, current free slots : 2 and trying to launch
> attempt_200901270818_0006_m_000602_0
> 2009-01-27 14:04:17,744 INFO org.apache.hadoop.mapred.TaskTracker: JVM with
> ID: jvm_200901270818_0006_m_176495965 given task:
> attempt_200901270818_0006_m_000602_0
> 2009-01-27 14:04:24,020 INFO org.apache.hadoop.mapred.TaskTracker:
> attempt_200901270818_0006_m_000602_0 1.0%
> 2009-01-27 14:04:27,023 INFO org.apache.hadoop.mapred.TaskTracker:
> attempt_200901270818_0006_m_000602_0 1.0%
> 2009-01-27 14:04:30,026 INFO org.apache.hadoop.mapred.TaskTracker:
> attempt_200901270818_0006_m_000602_0 1.0%
> 2009-01-27 14:04:30,362 INFO org.apache.hadoop.mapred.TaskTracker:
> attempt_200901270818_0006_m_000602_0 1.0%
> 2009-01-27 14:04:30,362 INFO org.apache.hadoop.mapred.TaskTracker: Task
> attempt_200901270818_0006_m_000602_0 is done.
> 2009-01-27 14:04:30,362 INFO org.apache.hadoop.mapred.TaskTracker: reported
> output size for attempt_200901270818_0006_m_000602_0 was 0
> {noformat}
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