It's not necessary but I found it useful a couple of times. For example, all 
developers have exactly the same versions and I rarely hear "works for me" 
these days. I also had some cases where I wanted to try an older commit but 
since some downstream dependency changed, the code didn't work. I've never had 
this issue since we started using lockfiles in the repo itself. @wesm are you 
worried about the additional overhead of having this large file in the repo?

[ Full content available at: https://github.com/apache/arrow/pull/2598 ]
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