Github user takezoe commented on the issue:
https://github.com/apache/incubator-predictionio/issues/363
> It would probably be a little tricky to keep the code compatible with
both Spray and Akka HTTP though.
I really think so. It will bring confusion and need extra effort for
maintenance. In my opinion, moving to Akka HTTP should be waited until
PredictionIO can cut Scala 2.10 support.
@dszeto Sorry, I should have made discussion in the dev list or JIRA. I
will add my opinion about this issue to JIRA later.
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