I'm a little bit late but posting in case somebody googles this.
It seems saveAsTextFile requires chmod 777 but the local directory won't
default to give w to other users.
I've tried saving to a mounted drive and was able to save without an error.
Without the the "file", it won't save to the file system.
e.g.
rdd.saveAsTextFile("file:////mnt/shared/emp")
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