[MAPREDUCE-4415] Backport the Job.getInstance methods from MAPREDUCE-1505 to branch-1

• Type: Improvement
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 1.0.0
• Fix Version/s: 1.2.0
• Component/s: mrv1
• Hadoop Flags: Reviewed
• Release Note: Backported new APIs to get a Job object to 1.2.0 from 2.0.0. Job API static methods Job.getInstance(), Job.getInstance(Configuration) and Job.getInstance(Configuration, jobName) are now available across both releases to avoid porting pain.
• Assignee: Harsh J
• Reporter: Harsh J
• Created: 09/Jul/12 20:37
• Updated: 15/May/13 05:16
• Resolved: 24/Jul/12 17:56

Description

In 2.x MR, the Job constructors have all been deprecated in favor of Job.getInstance() calls to get a Job object.

However, these getInstance methods do not appear to be present in the 1.x MR API, and thereby may cause additional pain to users moving from 1.x to 2.x going forward.

This patch proposes to add in the getInstance style of methods with suitable test coverage for both style of constructors, while not pulling in anything else from MAPREDUCE-1505 (as we lack 'Cluster' in 1.x). As we're not going to be deprecating the regular ctors in a 1.x release, this is not an incompatible change in any way.