[jira] Created: (MAPREDUCE-1498) Map reduce delegate token should be automatically set by the frontend

["Daniel Dai (JIRA)" <ji...@apache.org>]

Map reduce delegate token should be automatically set by the frontend
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                 Key: MAPREDUCE-1498
                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-1498
             Project: Hadoop Map/Reduce
          Issue Type: Improvement
          Components: client
    Affects Versions: 0.22.0
            Reporter: Daniel Dai
             Fix For: 0.22.0


Currently, if we need to create Job/JobClient object in the backend, we need to add following code in the frontend:

Token<DelegationTokenIdentifier> mrDelegationToken = jobClient.getDelegationToken(new Text());
TokenCache.addDelegationToken("JobTracker", mrDelegationToken);

Once we add this code, application is no longer compilable with old hadoop library. This add code maintenance burden to the application developer. If this is a common enough use case, we shall put this code in the core code rather than let application developer consume the pain.

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