[GitHub] [kafka] dongjinleekr commented on pull request #10176: KAFKA-12359: Update Jetty to 11

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dongjinleekr commented on pull request #10176:
URL: https://github.com/apache/kafka/pull/10176#issuecomment-851818497


   For those who are interested in this issue, here is some context:
   
   As you can see in the table below (from [here](https://www.eclipse.org/jetty/)), the change between Jetty 9.4 and Jetty 11 is not only Servlet versions; it involves Servlet version, package namespace, API changes, and related dependencies. For this reason, Upgrading Jetty from 9.4 is never a simple task but a complicated one that requires lots of changes, tests, etc.
   
   ![Eclipse-Jetty-The-Eclipse-Foundation](https://user-images.githubusercontent.com/2375128/120270720-03ae8380-c2e5-11eb-97ea-52e2d2f12fdf.png)
   
   The problem is: **the current 9.4's End of Life seems not a too distant future**; For instance, [Jetty 9.2 reached the end of life in March 2018](https://www.eclipse.org/lists/jetty-announce/msg00116.html), and [9.3 also did in February 2020](https://www.eclipse.org/lists/jetty-announce/msg00140.html) (i.e., in two years). 9.3 also dropped Java 7 support from before its final release. Although the Jetty team does not mention it explicitly, the community seems to expect it to reach the EOL in 2022 when Jetty 10.x and 11.x becomes stable and widespread. If this thing happens, we should also migrate to Jetty 11, along with Java 11.
   
   I agree with @ijuma that it is too early to discuss this issue. However, I think we have enough reason to recognize this problem. **I will keep my eyes on Jetty 9.4's EOL issue and as soon as it becomes certain, I will reopen the PR.**
   
   +1. For those who hope to test Kafka Connect on Servlet 5: I will start providing a preview soon like [log4j2 appender](http://home.apache.org/~dongjin/post/apache-kafka-log4j2-support/).


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