Github user shimamoto commented on the issue:
https://github.com/apache/incubator-predictionio/pull/441
> yes, it requires two SparkContexts because PredictionIO implicitly stops
the first one after preparing deploy, so it cannot be reused for the second
instance to run queries.
@mars Oh, I see. But when using a persisted model, PredictionIO don't stop
the first SparkContext.
https://github.com/apache/incubator-predictionio/blob/v0.12.0-incubating/core/src/main/scala/org/apache/predictionio/controller/Engine.scala#L241-L250
I guess this causes, for example, if we use the Recommendation Engine
Template, which supports loading a persisted model
([see](https://github.com/apache/incubator-predictionio-template-recommender/blob/develop/src/main/scala/ALSModel.scala)).
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