Github user pwendell commented on the pull request:
https://github.com/apache/spark/pull/158#issuecomment-38950091
@haoyuan hey HY - the issue is mostly around keeping the complexity of the
code minimal and avoiding a bunch of code duplication. The code around deleting
this subdirectories is not trivial and right now the functions are just
copy/pasted for Tachyon. I'll look at it a bit more...
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