Github user tgravescs commented on the pull request:
https://github.com/apache/spark/pull/204#issuecomment-39449932
Its not readable by other users in the intermediate directory. Sorry I
didn't explain fully. That directory itself is 1777, sticky bit set, world
writable. Each user creates a subdirectory in there that is only readable by
them and superuser group, history files are then written to that user directory
with permissions so that only that user and group can read/write.
The reasons for it moving it to the done directory are more for management
reasons. It orders them by date, and then within a date makes sure one
directory doesn't get to big, deletes them after a retention period (having
them ordered by date makes that simple), etc.
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