[GitHub] tysonnorris opened a new pull request #2584: SPI for Loadbalancer

[gi...@git.apache.org]

tysonnorris opened a new pull request #2584: SPI for Loadbalancer
URL: https://github.com/apache/incubator-openwhisk/pull/2584
 
 
   To allow deployments to customize the Loadbalancer impls. Currently same Loadbalancer is used for all traffic, but future enhancements could use multiple load balancers for different traffic patterns.
   
   Default is whisk.core.loadBalancer.LoadBalancerServiceProvider, which wraps the existing LoadBalancer impl  (Kafka + InvokerPool) behind the SPI for instantiation.
   
   To decouple up the SPI interface for LoadBalancer from implementation details, no ArtifactStore stores are passed as parameters into LoadBalancerService anymore. CouchDbStoreProvider caches stores by name, so they can be fetched via SPI in multiple places and resolve to the same store instance.  Now LoadBalancerService can do `WhiskEntityStore.datastore(config)` to acquire the entityStore.
 
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