Github user pwendell commented on the pull request:
https://github.com/apache/spark/pull/607#issuecomment-41933135
@tgravescs @sryza just wondering - how does `ugi.doAs` actually store the
contextual information of the credentials? For instance, we create thread pools
etc inside of the executor. Does this get transferred correctly? I'm not
totally sure how this would work... does it use threadlocals?
Since the security model of Spark currently assumes the application is run
as a single user, it seems like moving this up makes sense. Would either of you
be able to propose a patch that just pulls it up, maybe, e.g. to wrap the
creation of the thread pool?
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