Comment 5 for bug 1484598

So there's two cases we might consider covered with this bug - and we might have to split them up because they have different consequences and likelyhood.

One way to have "multiple fragments" is a rebalance - this is multiple fragments *for the same timestamp*.

Another way to consider "multiple fragments" would be multiple data files with the *same* fragment and different timestamps. This happens when you have non-durable fragments piled over a durable fragment:

https://gist.github.com/clayg/1f2590ea4608a13823865e27a6666c2a