UGI should load tokens from the environment
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Key: HADOOP-6520
URL: https://issues.apache.org/jira/browse/HADOOP-6520
Project: Hadoop Common
Issue Type: Bug
Reporter: Owen O'Malley
For MapReduce tasks, we need not only the task itself, but child processes to
get the delegation tokens, therefore we need an environment variable that if
set loads a token cache into the login UGI. The task tracker can set this
property so that tasks (and child processes of the tasks, such as streaming and
pipes) have the job's tokens automatically.
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