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From "Amareshwari Sriramadasu (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-5198) NPE in Shell.runCommand()
Date Tue, 17 Feb 2009 08:19:59 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-5198?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12674139#action_12674139

Amareshwari Sriramadasu commented on HADOOP-5198:

bq. Can pid become null between where you check for it and where you call ProcessTree.destroy(...)?
No. pid cannnot become null. Once obtained from the file, it is stored in a String and passed
to the kill-process.

bq. Can you write a unit test? If not, can you describe the steps of the manual testing you
did to ensure this patch works?
This is almost all the time reproducible by running MRReliability test on single-node cluster
and occasional failures on cluster. I didnt see any failure after the patch.

> NPE in Shell.runCommand()
> -------------------------
>                 Key: HADOOP-5198
>                 URL: https://issues.apache.org/jira/browse/HADOOP-5198
>             Project: Hadoop Core
>          Issue Type: Bug
>          Components: mapred, util
>    Affects Versions: 0.21.0
>            Reporter: Amareshwari Sriramadasu
>            Assignee: Amareshwari Sriramadasu
>             Fix For: 0.21.0
>         Attachments: patch-5198.txt
>   Original Estimate: 0h
>  Remaining Estimate: 0h
> I have seen one of the task failures with following exception:
> java.lang.NullPointerException
> 	at java.lang.ProcessBuilder.start(ProcessBuilder.java:441)
> 	at org.apache.hadoop.util.Shell.runCommand(Shell.java:149)
> 	at org.apache.hadoop.util.Shell.run(Shell.java:134)
> 	at org.apache.hadoop.util.Shell$ShellCommandExecutor.execute(Shell.java:286)
> 	at org.apache.hadoop.util.ProcessTree.isAlive(ProcessTree.java:244)
> 	at org.apache.hadoop.util.ProcessTree.sigKillInCurrentThread(ProcessTree.java:67)
> 	at org.apache.hadoop.util.ProcessTree.sigKill(ProcessTree.java:115)
> 	at org.apache.hadoop.util.ProcessTree.destroyProcessGroup(ProcessTree.java:164)
> 	at org.apache.hadoop.util.ProcessTree.destroy(ProcessTree.java:180)
> 	at org.apache.hadoop.mapred.JvmManager$JvmManagerForType$JvmRunner.kill(JvmManager.java:377)
> 	at org.apache.hadoop.mapred.JvmManager$JvmManagerForType.reapJvm(JvmManager.java:249)
> 	at org.apache.hadoop.mapred.JvmManager$JvmManagerForType.access$000(JvmManager.java:113)
> 	at org.apache.hadoop.mapred.JvmManager.launchJvm(JvmManager.java:76)
> 	at org.apache.hadoop.mapred.TaskRunner.run(TaskRunner.java:411)

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