Github user chanlee514 commented on the issue:
https://github.com/apache/incubator-predictionio/pull/328
@pferrel: I agree, and that would be possible with a general metadata
registry server which would be the next step. The reason I started by removing
manifest.json is because the previous database-dependent build was a roadblock
for PredictionIO in PaaS platforms such as Heroku.
Information in engine.json is written during `pio train` as engineInstance.
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