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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