Cleanup task tokens interface
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Key: MAPREDUCE-4069
URL: https://issues.apache.org/jira/browse/MAPREDUCE-4069
Project: Hadoop Map/Reduce
Issue Type: Improvement
Components: mrv2
Affects Versions: 0.23.2
Reporter: Jason Lowe
Priority: Minor
This tracks a couple of cleanup issues that were identified in MAPREDUCE-4043:
* It seems unnecessary to pass the job token and credentials separately when we
always combine the job token into the credentials before building the container
launch context. The TaskImpl and TaskAttemptImpl constructors could simply
take credentials with the job token already added rather than separate job
token and credential parameters.
* It's unclear whether we still need the appTokens file that is placed into
HDFS by the job submitter, localized by the NM, and finally read in by the AM.
I believe the AM's credentials sent in the AM's container launch context
already contains the same information. If that's the case, we should remove
the code related to the appTokens file.
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