[HDFS-2930] bin/hdfs should print a message when an invalid command is specified

• Type: Improvement
• Status: Resolved
• Priority: Major
• Resolution: Not A Problem
• Affects Version/s: 0.23.1
• Component/s: tools
• Labels: newbie
• Target Version/s: 2.0.0-alpha
• Release Note: bin/hdfs prints a proper message instead of throwing ClassNotFound java exception.
• Assignee: Unassigned
• Reporter: Eli Collins
• Created: 09/Feb/12 22:24
• Updated: 08/Feb/15 17:59
• Resolved: 08/Feb/15 17:59

Description

hdfs will currently give a NoClassDefFoundError stacktrace if there's a typo specifying the command.

hadoop-0.24.0-SNAPSHOT $ ./bin/hdfs dfadmin
Exception in thread "main" java.lang.NoClassDefFoundError: dfadmin
Caused by: java.lang.ClassNotFoundException: dfadmin
	at java.net.URLClassLoader$1.run(URLClassLoader.java:202)
	at java.security.AccessController.doPrivileged(Native Method)
	at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:307)
	at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:248)

Issue Links

• is duplicated by: HADOOP-11092 hadoop shell commands should print usage if not given a class