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What I learned about fs.writeFile today

Thanks to Frank Leahy, I believe I now understand what's causing the persistent but intermittent Node.js fs.writeFile problem, discussed earlier. Here's the story... fs.writeFile is not an indivisible operation. It makes lower-level filesystem calls each of which is asynchronous. That's cool, usually -- unless for some reason that a request to write the same file comes in while it already has one outstanding.
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