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https://issues.apache.org/jira/browse/HADOOP-5130?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Devaraj Das resolved HADOOP-5130.
---------------------------------
Resolution: Won't Fix
Arun confirmed that this problem was due to the IPV4/V6 issue. This is
discussed here -
http://mail-archives.apache.org/mod_mbox/hadoop-core-user/200812.mbox/%3cc56ed656.c28c%[email protected]%3e
Adding -Djava.net.preferIPv4Stack=true to mapred.child.java.opts fixes the
problem.
> 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: Blocker
> Fix For: 0.20.0
>
>
> 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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