chetanmeh opened a new pull request #4628: Embedded Kafka support in OpenWhisk Standalone mode URL: https://github.com/apache/openwhisk/pull/4628 Adds support for launching Embedded Kafka and Kafka Drop UI ## Description This PR adds support for launching an [embedded-kafka][1]. This is mostly meant to enable local development for features which need Kafka support (like User Event or Activation Persister Service etc). In this mode an inprocess Kafka Server (v2.1.1 currently) and Zookeeper Server ``` java -jar openwhisk-standalone.jar --kafka ``` Key aspects * Kafka version 2.1.1 is being used while we run with 0.11.0.1. Tried to use that but then it causes class compatability issue with newer version of Kafka client being used * This mode is also useful to simulate some of the integration test scenarios with Activation Persister Service * Kafka Server launched is supporting connection from both host and within Docker container based on [kafka listeners explanation][3] * Kafka and Zookeeper generated files are stored in `~/.openwhisk/standalone/server-3233/tmp` and are removed upon restart Once launched you can see the details of port used etc as below ``` [ 9092 ] localhost:9092 (kafka) [ 9092 ] 192.168.65.2:9091 (kafka-docker) [ 2181 ] Zookeeper (zookeeper) [ 9000 ] http://localhost:9000 (whisk-kafka-drop-ui) ``` ### Kafka Ui - Kafdrop 3 This PR also adds support for launching an optional [Kafdrop 3][2] ``` java -jar openwhisk-standalone.jar --kafka --kafka-ui ``` This UI can help a developer to understand the structure of messages exchanged on various topics easily  ## 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 - [ ] 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/openwhisk/blob/master/CONTRIBUTING.md). - [ ] I reviewed the [style guides](https://github.com/apache/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. [1]: https://github.com/embeddedkafka/embedded-kafka [2]: https://github.com/obsidiandynamics/kafdrop [3]: https://rmoff.net/2018/08/02/kafka-listeners-explained/
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