cinder/releasenotes/notes/add-stochastic-scheduling-o...

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features:
- Added a new config option ``scheduler_weight_handler``. This is a global
option which specifies how the scheduler should choose from a listed of
weighted pools. By default the existing weigher is used which always
chooses the highest weight.
- Added a new weight handler ``StochasticHostWeightHandler``. This weight
handler chooses pools randomly, where the random probabilities are
proportional to the weights, so higher weighted pools are chosen more
frequently, but not all the time. This weight handler spreads new
shares across available pools more fairly.