The number of individual streams, and thus products, is limited to Int.MaxValue.

The groupBy operator holds the references to these streams in memory, opening a possible out of memory issue here.

As the first problem is also related to the usage of groupBy, we may say that we only have one problem: the usage of groupBy.

For a limited amount of data, the proposed solution is perfectly fine. We will discuss an alternate approach in the upcoming chapters.

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