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Posted to common-dev@hadoop.apache.org by "Amareshwari Sriramadasu (JIRA)" <ji...@apache.org> on 2009/01/27 09:28:59 UTC
[jira] Commented: (HADOOP-5130) TaskTracker seems to hold onto the
assigned task for a long while before launching it
[ https://issues.apache.org/jira/browse/HADOOP-5130?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12667619#action_12667619 ]
Amareshwari Sriramadasu commented on HADOOP-5130:
-------------------------------------------------
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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