Chan created PIO-47:
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Summary: Remove engine manifest for stateless build
Key: PIO-47
URL: https://issues.apache.org/jira/browse/PIO-47
Project: PredictionIO
Issue Type: New Feature
Reporter: Chan
As discussed in the dev mailing list, removing engine manifest would be the
first step in improving the workflow towards a more modular design.
- Remove manifest.json completely. `pio build` will be stateless, and will not
write anything to the database. This will make it easier to compile/build on
PaaS platforms such as Heroku. Later, we can remove `pio build` command
entirely, so that PIO is independent of the build tool (sbt).
- An immediate major disadvantage would be not being able to run pio commands
outside of the engine directory. This can be resolved in the next step of
creating a general metadata registry.
- Meanwhile, we can use engineFactory as **engineId**, and SHA-1 hash of engine
filepath as **engineVersion** (as before). We can improve this when designing a
metadata registry,
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