ningyougang opened a new pull request #4459: Close the consumer when 
WakeupExcpetion happened
URL: https://github.com/apache/incubator-openwhisk/pull/4459
 
 
   <!--- Provide a concise summary of your changes in the Title -->
   
   ## Description
   <!--- Provide a detailed description of your changes. -->
   <!--- Include details of what problem you are solving and how your changes 
are tested. -->
   Kafka's consumer.wakeup() is to `shutdown consumer gracefully`.
   In KafkaConsumerConnector.scala, has below points, exist `WakupException 
happend`
   * peek(wakup() is called, then execute poll, WakupException happened)
   * commit (Actually, when do this action, wakup() is called)
   * metric reporting scheduler (wakup() is called, then execute endOffsets, 
WakupException happened)
   
   Regarding peek, handle its own way.
   Regarding commit and metric reporting scheduler, it is better to close the 
consumer.
   
   ## 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
   - [x] Message Bus (e.g., Kafka)
   - [ ] Loadbalancer
   - [ ] Invoker
   - [ ] Intrinsic actions (e.g., sequences, conductors)
   - [ ] Data stores (e.g., CouchDB)
   - [ ] 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).
   - [ ] 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. -->
   
   - [ ] I signed an [Apache 
CLA](https://github.com/apache/incubator-openwhisk/blob/master/CONTRIBUTING.md).
   - [ ] 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.
   - [ ] My changes require further changes to the documentation.
   - [ ] I updated the documentation where necessary.
   
   

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