[ https://issues.apache.org/jira/browse/HADOOP-9267?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Andrew Wang updated HADOOP-9267: -------------------------------- Attachment: hadoop-9267-2.patch Sure, new patch with same changes to the yarn script. > hadoop -help, -h, --help should show usage instructions > ------------------------------------------------------- > > Key: HADOOP-9267 > URL: https://issues.apache.org/jira/browse/HADOOP-9267 > Project: Hadoop Common > Issue Type: Bug > Affects Versions: 3.0.0 > Reporter: Andrew Wang > Assignee: Andrew Wang > Priority: Minor > Attachments: hadoop-9267-1.patch, hadoop-9267-2.patch > > > It's not friendly for new users when the command line scripts don't show > usage instructions when passed the defacto Unix usage flags. Imagine this > sequence of commands: > {noformat} > -> % hadoop --help > Error: No command named `--help' was found. Perhaps you meant `hadoop -help' > -> % hadoop -help > Error: No command named `-help' was found. Perhaps you meant `hadoop help' > -> % hadoop help > Exception in thread "main" java.lang.NoClassDefFoundError: help > Caused by: java.lang.ClassNotFoundException: help > at java.net.URLClassLoader$1.run(URLClassLoader.java:202) > at java.security.AccessController.doPrivileged(Native Method) > at java.net.URLClassLoader.findClass(URLClassLoader.java:190) > at java.lang.ClassLoader.loadClass(ClassLoader.java:306) > at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301) > at java.lang.ClassLoader.loadClass(ClassLoader.java:247) > Could not find the main class: help. Program will exit. > {noformat} > Same applies for the `hdfs` script. -- This message is automatically generated by JIRA. If you think it was sent incorrectly, please contact your JIRA administrators For more information on JIRA, see: http://www.atlassian.com/software/jira