Github user takezoe commented on the issue:
https://github.com/apache/incubator-predictionio/pull/421
> I addressed all your Scala style & usage suggestions.
ð
> Still need to take care of the threadsafety issue with the singleton
client.
Yes, I'm reviewing the PIO codebase from this point of view now, but still
my understanding about the whole PIO is not enough...
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