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From Pat Ferrel <>
Subject Re: EventServer -- realtime data --> PredictionServer
Date Mon, 07 May 2018 22:28:51 GMT
The EventServer can respond to queries made by the PredictionServer in
realtime. In the case of the Universal Recommender, which is where that
diagram came from, it takes
realtime user behavior to make the internal query to Elasticsearch, which
returns recommendations. So realtime user behavior is used for queries.
Building models is done offline periodically but they needn’t be done in
realtime, the model doesn’t change rapidly for recommenders except for
special edge use cases.

PIO Templates are free to use the services of PIO is their own manner so
the answer may be slightly different for other Engines.

From: gerasimos xydas <>
Reply: <>
Date: May 7, 2018 at 8:15:09 AM
To: <>
Subject:  EventServer -- realtime data --> PredictionServer


Can someone please explain the "realtime data" flow from EventServer to
PredictionServer in the below diagram (taken from

Thank you,

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