Github user pwendell commented on the pull request:
https://github.com/apache/spark/pull/158#issuecomment-38945893
@haoyuan but with Tachyon you create a new folder for each application.
Then within the application you have O(RDD blocks) files. This is way less than
O(shuffle blocks) files which happens withe the DiskStore - shuffle blocks tend
to be (RDD blocks)^2. What is the limitation of the number of files inside of a
Tachyon directory? How large can it be before performance starts to suffer?
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