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https://issues.apache.org/jira/browse/HADOOP-5781?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12706944#action_12706944
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Steve Loughran commented on HADOOP-5781:
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Full output is the kill usage manual.
-probably best for the methods to do some parameter checking, possbly raising
NPEs to track this down
[sf-startdaemon-debug] 09/05/07 16:42:42 [Map-events fetcher for all reduce
tasks on tracker_morzine.hpl.hp.com:localhost/127.0.0.1:36239] INFO
mapred.TaskTracker : Shutting down: Map-events fetcher for all reduce tasks on
tracker_morzine.hpl.hp.com:localhost/127.0.0.1:36239
[sf-startdaemon-debug] 09/05/07 16:42:42 [TerminatorThread] WARN
util.ProcessTree : Error executing shell command
org.apache.hadoop.util.Shell$ExitCodeException: ERROR: garbage process ID
"-null".
[sf-startdaemon-debug] Usage:
[sf-startdaemon-debug] kill pid ... Send SIGTERM to every
process listed.
[sf-startdaemon-debug] kill signal pid ... Send a signal to every
process listed.
[sf-startdaemon-debug] kill -s signal pid ... Send a signal to every
process listed.
[sf-startdaemon-debug] kill -l List all signal names.
[sf-startdaemon-debug] kill -L List all signal names in a
nice table.
[sf-startdaemon-debug] kill -l signal Convert between signal
numbers and names.
[sf-startdaemon-debug] 09/05/07 16:42:42 [TerminatorThread] INFO
util.ProcessTree : Killing all processes in the process group null with
SIGTERM. Exit code 1
[sf-startdaemon-debug] 09/05/07 16:42:42
[org.apache.hadoop.hdfs.server.namenode.fsnamesystem$replicationmoni...@826cdb7]
WARN namenode.FSNamesystem : ReplicationMonitor thread received
InterruptedException.java.lang.InterruptedException: sleep interrupted
[sf-startdaemon-debug] 09/05/07 16:42:42 [org.apache.hadoop.hdfs
> ProcessTree can try and kill a "null" POD
> -----------------------------------------
>
> Key: HADOOP-5781
> URL: https://issues.apache.org/jira/browse/HADOOP-5781
> Project: Hadoop Core
> Issue Type: Bug
> Components: mapred
> Affects Versions: 0.21.0
> Reporter: Steve Loughran
> Priority: Minor
>
> Saw this in a test run, while trying to shut down a TaskTracker
> [sf-startdaemon-debug] 09/05/07 16:42:42 [Map-events fetcher for all reduce
> tasks on tracker_morzine.hpl.hp.com:localhost/127.0.0.1:36239] INFO
> mapred.TaskTracker : Shutting down: Map-events fetcher for all reduce tasks
> on tracker_morzine.hpl.hp.com:localhost/127.0.0.1:36239
> [sf-startdaemon-debug] 09/05/07 16:42:42 [TerminatorThread] WARN
> util.ProcessTree : Error executing shell command
> org.apache.hadoop.util.Shell$ExitCodeException: ERROR: garbage process ID
> "-null".
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