Hi,

I'm currently working on some code in Flink's runtime and want to use some
Java Primitive Collections to improve performance.

As fas as I can see no Primitive Collections library is in the dependencies
so I wanted to ask if anybody has any preferences or input on which library
the project should use.

The viable candidates (from a licensing perspective at least) are:

- Apache Commons Primitives Collections
- High Performance Primitives Collections for Java (HPPC)
- fastutil

They are all APL 2.0 licensed.

Since I'm probably not the only one who is going to use Primitive
Collections I don't want to introduce a new dependency without any
discussion.

Cheers,
Robert

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