[HADOOP-2268] JobControl classes should use interfaces rather than implemenations

• Type: Improvement
• Status: Closed
• Priority: Minor
• Resolution: Fixed
• Affects Version/s: 0.15.0
• Fix Version/s: 0.16.0
• Assignee: Adrian Woodhead
• Reporter: Adrian Woodhead
• Created: 23/Nov/07 10:55
• Updated: 08/Jul/09 16:52
• Resolved: 09/Jan/08 20:13

Description

See HADOOP-2202 for background on this issue. Arun C. Murthy agrees that when possible it is preferable to program against the interface rather than a concrete implementation (more flexible, allows for changes of the implementation in future etc.) JobControl currently exposes running, waiting, ready, successful and dependent jobs as ArrayList rather than List. I propose to change this to List.

I will code up a patch for this.

Issue Links

• is related to: MAPREDUCE-245 Job and JobControl classes should return interfaces rather than implementations