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https://issues.apache.org/jira/browse/HADOOP-5198?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12671803#action_12671803
]
Amareshwari Sriramadasu commented on HADOOP-5198:
-------------------------------------------------
corresponding TaskTracker logs :
{noformat}
2009-02-09 10:32:54,062 INFO org.apache.hadoop.mapred.TaskTracker:
LaunchTaskAction (registerTask): attempt_200902090818_0001_m_009589_1 task's
state:KILLED_UNCLEAN
2009-02-09 10:32:54,062 INFO org.apache.hadoop.mapred.TaskTracker: Trying to
launch : attempt_200902090818_0001_m_009589_1
2009-02-09 10:32:54,062 INFO org.apache.hadoop.mapred.TaskTracker: In
TaskLauncher, current free slots : 1 and trying to launch
attempt_200902090818_0001_m_009589_1
2009-02-09 10:32:54,281 INFO org.apache.hadoop.mapred.JvmManager: In JvmRunner
constructed JVM ID: jvm_200902090818_0001_m_-1842952603
2009-02-09 10:32:54,281 INFO org.apache.hadoop.mapred.JvmManager: JVM Runner
jvm_200902090818_0001_m_-1842952603 spawned.
2009-02-09 10:32:56,119 INFO org.apache.hadoop.mapred.TaskTracker: JVM with ID:
jvm_200902090818_0001_m_-1842952603 given task:
attempt_200902090818_0001_m_009589_1
2009-02-09 10:32:57,031 INFO org.apache.hadoop.mapred.TaskTracker:
attempt_200902090818_0001_m_009589_1 0.0%
2009-02-09 10:32:57,048 INFO org.apache.hadoop.mapred.TaskTracker:
attempt_200902090818_0001_m_009589_1 0.0% cleanup
2009-02-09 10:32:57,050 INFO org.apache.hadoop.mapred.TaskTracker: Task
attempt_200902090818_0001_m_009589_1 is done.
2009-02-09 10:32:57,050 INFO org.apache.hadoop.mapred.TaskTracker: reported
output size for attempt_200902090818_0001_m_009589_1 was 0
2009-02-09 10:32:57,052 INFO org.apache.hadoop.mapred.TaskRunner:
attempt_200902090818_0001_m_009589_1 done; removing files.
2009-02-09 10:32:57,055 INFO org.apache.hadoop.mapred.TaskTracker: addFreeSlot
: current free slots : 1
2009-02-09 10:32:57,070 INFO org.apache.hadoop.mapred.TaskTracker:
LaunchTaskAction (registerTask): attempt_200902090818_0001_m_009910_1 task's
state:UNASSIGNED
2009-02-09 10:32:57,070 INFO org.apache.hadoop.mapred.TaskTracker: Trying to
launch : attempt_200902090818_0001_m_009910_1
2009-02-09 10:32:57,070 INFO org.apache.hadoop.mapred.TaskTracker: In
TaskLauncher, current free slots : 1 and trying to launch
attempt_200902090818_0001_m_009910_1
2009-02-09 10:32:57,200 INFO org.apache.hadoop.mapred.JvmManager: Killing JVM:
jvm_200902090818_0001_m_-1842952603
2009-02-09 10:32:57,251 WARN org.apache.hadoop.util.ProcessTree: Error
executing shell command org.apache.hadoop.util.Shell$ExitCodeException: kill:
can't find process "-null"
2009-02-09 10:32:57,251 INFO org.apache.hadoop.util.ProcessTree: Killing all
processes in the process group null with SIGTERM. Exit code 1
2009-02-09 10:32:57,252 INFO org.apache.hadoop.mapred.JvmManager: JVM :
jvm_200902090818_0001_m_-1842952603 exited. Number of tasks it ran: 1
2009-02-09 10:32:57,256 WARN org.apache.hadoop.mapred.TaskRunner:
attempt_200902090818_0001_m_009910_1 Child Error
java.lang.NullPointerException
at java.lang.ProcessBuilder.start(ProcessBuilder.java:441)
at org.apache.hadoop.util.Shell.runCommand(Shell.java:149)
at org.apache.hadoop.util.Shell.run(Shell.java:134)
at org.apache.hadoop.util.Shell$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$000(JvmManager.java:113)
at org.apache.hadoop.mapred.JvmManager.launchJvm(JvmManager.java:76)
at org.apache.hadoop.mapred.TaskRunner.run(TaskRunner.java:411)
{noformat}
> NPE in Shell.runCommand()
> -------------------------
>
> Key: HADOOP-5198
> URL: https://issues.apache.org/jira/browse/HADOOP-5198
> Project: Hadoop Core
> Issue Type: Bug
> Components: mapred, util
> Affects Versions: 0.21.0
> Reporter: Amareshwari Sriramadasu
> Fix For: 0.21.0
>
>
> I have seen one of the task failures with following exception:
> java.lang.NullPointerException
> at java.lang.ProcessBuilder.start(ProcessBuilder.java:441)
> at org.apache.hadoop.util.Shell.runCommand(Shell.java:149)
> at org.apache.hadoop.util.Shell.run(Shell.java:134)
> at
> org.apache.hadoop.util.Shell$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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