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Add 15s cache for ratings #1
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Problem: I just added a webcache to enhance the performance of the ratings service. I want to test it but I don't yet want to deploy it to production, and I don't want to replicate the existing ratings service in my test environment. Besides, whenever I run ratings locally, it's pretty fast - seems to only get slow in production. Solution: Add a new experiment template for this - I'll define an experimental deployment of the services I'm interested in and then use AspenMesh & Istio to route traffic to my deployments.
Problem: Sometimes the ratings service is slow to return results. Solution: Make a simple cache - if it is less than 15s since we last got the ratings for this productid, just use the ratings from the cache.
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