Github user mateiz commented on the pull request:
https://github.com/apache/spark/pull/457#issuecomment-40987590
@markhamstra I tried -diagrams for a bit but it complained that Graphviz
failed on too many of our files, and then it gave up on generating them. It
might be possible to debug it but I'd push it for later -- it sounds like this
feature isn't 100% robust (my guess is that it generated .dot files that
Graphviz wasn't able to parse).
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