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From "Harsh J (JIRA)" <j...@apache.org>
Subject [jira] [Created] (MAPREDUCE-4931) Add user-APIs for classpath precedence control
Date Thu, 10 Jan 2013 18:58:13 GMT
Harsh J created MAPREDUCE-4931:

             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:

void setUserClassesTakesPrecedence(boolean)
boolean userClassesTakesPrecedence()

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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