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https://issues.apache.org/jira/browse/HADOOP-4490?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12688213#action_12688213
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Vinod K V commented on HADOOP-4490:
-----------------------------------
Found a problem while this patch was being tested. When a TT was being
re-inited by JT after it's lost for some time, TT got the following NPE and it
crashed completely.
{code}
2009-03-22 22:22:36,155 ERROR org.apache.hadoop.mapred.TaskTracker: Can not
start task tracker because java.lang.NullPointerException
at
org.apache.hadoop.mapred.LinuxTaskController.buildTaskCommandArgs(LinuxTaskController.java:183)
at
org.apache.hadoop.mapred.LinuxTaskController.killTaskJVM(LinuxTaskController.java:237)
at
org.apache.hadoop.mapred.JvmManager$JvmManagerForType$JvmRunner.kill(JvmManager.java:401)
at
org.apache.hadoop.mapred.JvmManager$JvmManagerForType.stop(JvmManager.java:211)
at org.apache.hadoop.mapred.JvmManager.stop(JvmManager.java:61)
at org.apache.hadoop.mapred.TaskTracker.close(TaskTracker.java:925)
at org.apache.hadoop.mapred.TaskTracker.run(TaskTracker.java:1815)
at org.apache.hadoop.mapred.TaskTracker.main(TaskTracker.java:2899)
{code}
> Map and Reduce tasks should run as the user who submitted the job
> -----------------------------------------------------------------
>
> Key: HADOOP-4490
> URL: https://issues.apache.org/jira/browse/HADOOP-4490
> Project: Hadoop Core
> Issue Type: Sub-task
> Components: mapred, security
> Reporter: Arun C Murthy
> Assignee: Hemanth Yamijala
> Fix For: 0.21.0
>
> Attachments: HADOOP-4490-1.patch, HADOOP-4490-1.patch,
> HADOOP-4490-2.patch, hadoop-4490-design.pdf, HADOOP-4490.patch,
> HADOOP-4490.patch, HADOOP-4490.patch, HADOOP-4490.patch, HADOOP-4490.patch,
> HADOOP-4490.patch, HADOOP-4490.patch, HADOOP-4490_streaming.patch
>
>
> Currently the TaskTracker spawns the map/reduce tasks, resulting in them
> running as the user who started the TaskTracker.
> For security and accounting purposes the tasks should be run as the job-owner.
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