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We do have a 18GB xml (daily). I guess it will turn to 10 GB json when we convert it over.

Why is it even a question? Imagine a JSON of all the people on Earth.

The parent is joking. "Why would you ever need X?" is a classic question that bites every software engineer at some point. Somebody always needs X.

4194304 K ought to be enough for anybody.

Not many people. But in another 12 years?