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https://issues.apache.org/jira/browse/MAPREDUCE-5380?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13709301#comment-13709301
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Jason Lowe commented on MAPREDUCE-5380:
---------------------------------------
Thanks for taking this up, Stephen. I think mapred should also return a
non-zero exit code for this case:
{code}
echo "Sorry, the $COMMAND command is no longer supported."
echo "You may find similar functionality with the \"yarn\" shell command."
print_usage
exit
{code}
One could argue the no-arguments case is a similar situation where it shouldn't
return a success code. (Although I think the explicit --help|-help|-h case is
one where it should return 0 since it's doing exactly as instructed.)
> Invalid mapred command should return non-zero exit code
> -------------------------------------------------------
>
> Key: MAPREDUCE-5380
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-5380
> Project: Hadoop Map/Reduce
> Issue Type: Bug
> Affects Versions: 3.0.0, 2.0.4-alpha
> Reporter: Stephen Chu
> Assignee: Stephen Chu
> Attachments: MAPREDUCE-5380.patch
>
>
> Running the mapred bin script with an invalid command returns exit code 0,
> but it should return a non-zero exit code.
> {code}
> [schu@hdfs-snapshots-1 ~]$ hadoop-3.0.0-SNAPSHOT/bin/mapred gibberish
> gibberish - invalid command
> Usage: mapred [--config confdir] COMMAND
> where COMMAND is one of:
> pipes run a Pipes job
> job manipulate MapReduce jobs
> queue get information regarding JobQueues
> classpath prints the class path needed for running
> mapreduce subcommands
> historyserver run job history servers as a standalone daemon
> distcp <srcurl> <desturl> copy file or directories recursively
> archive -archiveName NAME -p <parent path> <src>* <dest> create a hadoop
> archive
> Most commands print help when invoked w/o parameters.
> [schu@hdfs-snapshots-1 ~]$ echo $?
> 0
> [schu@hdfs-snapshots-1 ~]$
> {code}
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