[MAPREDUCE-2944] Improve checking of input for Api displayTasks()

• Type: Improvement
• Status: Resolved
• Priority: Trivial
• Resolution: Fixed
• Affects Version/s: 2.0.0-alpha
• Fix Version/s: 3.0.0-alpha1
• Component/s: client
• Hadoop Flags: Reviewed
• Assignee: XieXianshan
• Reporter: XieXianshan
• Created: 07/Sep/11 15:21
• Updated: 12/May/16 21:23
• Resolved: 28/Dec/11 18:12

Description

The JobClient.displayTasks() will do nothing and won't throw any exception either,
while user call it with invalid type/state of task.
To be more friendly,it's better to remain user to check his parameters with an exception.

Sub-Tasks

• Remove hardcoded strings from the JC#displayTasks() call.: Resolved