[jira] [Created] (MAPREDUCE-4931) Add user-APIs for classpath precedence control

["Harsh J (JIRA)" <ji...@apache.org>]

Harsh J created MAPREDUCE-4931:
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             Summary: Add user-APIs for classpath precedence control
                 Key: MAPREDUCE-4931
                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-4931
             Project: Hadoop Map/Reduce
          Issue Type: Improvement
          Components: client
    Affects Versions: 1.0.0
            Reporter: Harsh J
            Priority: Minor


The feature config from MAPREDUCE-1938 of allowing tasks to start with user-classes-first is fairly popular and can use its own API hooks in Job/JobConf classes, making it easier to discover and use it rather than continuing to keep it as an advanced param.

I propose to add two APIs to Job/JobConf:

{code}
void setUserClassesTakesPrecedence(boolean)
boolean userClassesTakesPrecedence()
{code}

Both of which, depending on their branch of commit, set the property {{mapreduce.user.classpath.first}} (1.x) or {{mapreduce.job.user.classpath.first}} (trunk, 2.x and if needed, in 0.23.x).

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