Allow opting out of new routing algorithm by setting an env var #2590
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Due to #2579 we decided to make the new routing optional. One option was to only use the new routing when rolling restarting, but there isn't a good way to check if that is going on as far as I can tell. So in order to do this quickly, I am just adding a flag. I don't expect this to be a very commonly needed setting.
If there is a better way to check for rolling restarts, I can easily change the implementation of
useNewRouting
.