[GitHub] [flink] knaufk opened a new pull request #9192: [FLINK-12749] [docs] [examples] Initial Version of Flink Cluster Playground

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knaufk opened a new pull request #9192: [FLINK-12749] [docs] [examples] Initial Version of Flink Cluster Playground
URL: https://github.com/apache/flink/pull/9192
 
 
   ## Purpose of this Change
   
   Adds Flink Cluster Playground to Getting Started section of the documenation
   
   ## Brief change log
   
     - adds Flink Docker Playgrounds section to Getting Started guide
     - added additional example `ClickEventCount` to flink-examples
     - added first version of Flink Cluster Playground to documenation
     - [hotfix] upgrade Kafka Depdendency in flink-examples to the universal Kafka connector
   
   ## Verifying this change
   
   * build documentation and checkout /getting-started/docker-playgrounds
   * do a walkthrough of the complete playground
   * For this you will need a a local Flink image `flink:1.9-scala_2.11` as the official docker images for 1.9 have naturally not been published yet. You can do this by building this branch locally, and replacing /opt/flink in `flink:1.8.1-scala_2.11`. For this checkout `docker-flink` and modify `https://github.com/docker-flink/docker-flink/blob/master/1.8/scala_2.11-debian/Dockerfile. 
   
   ## Documentation
   
     - Does this pull request introduce a new feature? yes
     - If yes, how is the feature documented? docs
   

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