KeonHee opened a new pull request #5067:
URL: https://github.com/apache/openwhisk/pull/5067


   <!--- Provide a concise summary of your changes in the Title -->
   
   ## Description
   - In invoker and scheduler components, each host has a lease. This service 
manages lease to not disappear due to timeout.
   - Each host writes health data to etcd with this lease. When lease 
disappears by timeout, each host's health data disappear together, so it can be 
determined as an unhealthy host by the scheduler.
   - Because it is the service that has the greatest influence on the health 
state of the component, a dedicated dispatcher is allocated.
   
   ## Related issue and scope
   <!--- Please include a link to a related issue if there is one. -->
   - [ ] I opened an issue to propose and discuss this change (#????)
   
   ## 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
   - [ ] Invoker
   - [x] Scheduler
   - [ ] Intrinsic actions (e.g., sequences, conductors)
   - [ ] Data stores (e.g., CouchDB)
   - [x] Tests
   - [ ] 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/openwhisk/blob/master/CONTRIBUTING.md).
   - [x] I reviewed the [style 
guides](https://github.com/apache/openwhisk/wiki/Contributing:-Git-guidelines#code-readiness)
 and followed the recommendations (Travis CI will check :).
   - [x] I added tests to cover my changes.
   - [ ] My changes require further changes to the documentation.
   - [ ] I updated the documentation where necessary.
   
   


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