[GitHub] tysonnorris opened a new pull request #3497: allow singleton (active/passive) and replicated pools in invoker

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tysonnorris opened a new pull request #3497: allow singleton (active/passive) and replicated pools in invoker
URL: https://github.com/apache/incubator-openwhisk/pull/3497
 
 
   <!--- Provide a concise summary of your changes in the Title -->
   To support a cluster-aware deployment, the ContainerPool in invoker needs to a) be able to operate as a singleton with failover and b) be able to track state of containers within the cluster on all nodes
   
   ## Description
   This PR provides both, so that multiple invokers can be deployed while:
   * a single invoker is consuming from the invokers' topic (all invokers share the same topic)
   * in case of a failover, ContainerFactory impls have the opportunity to resurrect the ContainerPool freePool and prewarmPool, so that existing usable containers will remain usable.
   
   
   ## My changes affect the following components
   <!--- Select below all system components are affected by your change. -->
   <!--- Enter an `x` in all applicable boxes. -->
   - [ ] API
   - [ ] Controller
   - [ ] Message Bus (e.g., Kafka)
   - [ ] Loadbalancer
   - [x ] Invoker
   - [ ] Intrinsic actions (e.g., sequences, conductors)
   - [ ] Data stores (e.g., CouchDB)
   - [ ] Tests
   - [x ] Deployment
   - [ ] CLI
   - [ ] General tooling
   - [ ] Documentation
   
   ## Types of changes
   <!--- What types of changes does your code introduce? Use `x` in all the boxes that apply: -->
   - [ ] Bug fix (generally a non-breaking change which closes an issue).
   - [x ] Enhancement or new feature (adds new functionality).
   - [ ] Breaking change (a bug fix or enhancement which changes existing behavior).
   
   ## Checklist:
   <!--- Please review the points below which help you make sure you've covered all aspects of the change you're making. -->
   
   - [x ] I signed an [Apache CLA](https://github.com/apache/incubator-openwhisk/blob/master/CONTRIBUTING.md).
   - [x ] I reviewed the [style guides](https://github.com/apache/incubator-openwhisk/wiki/Contributing:-Git-guidelines#code-readiness) and followed the recommendations (Travis CI will check :).
   - [ ] I added tests to cover my changes.
   - [x ] My changes require further changes to the documentation.
   - [ ] I updated the documentation where necessary.
   
   

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