Stephen Chu created MAPREDUCE-5380:
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             Summary: 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: 2.0.4-alpha, 3.0.0
            Reporter: Stephen Chu
            Assignee: Stephen Chu


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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