Aikar ad73c0eb38 Many fixes and improvements to chunk prioritization ...

I believe this brings us back to stable. A lot of complexity was
learned about juggling priorities.

We were essentially promoting more chunks to urgent than really
needed to be urgent.

So this commit adds a lot more logic to juggle neighbor priorities
and demote their priority once they meet the requirements needed of
them.

This greatly improves the performance of "urgent" chunks".

Fixes #3410
Fixes #3426
Fixes #3425
Fixes #3416

2020-05-22 00:46:44 -04:00

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