Update Java11 description in "Deploying Distributed Cluster" page

[wuchong]

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Description

Software Requirements
Before you start to set up the system, make sure you have installed Java 17 or higher on each node in your cluster. Java 8 and Java 11 are not recommended.

It says "Java 8 and Java 11 are not recommended." I think we should improve this wording.
First, Java 8 is no longer supported, since the released binary is compiled with Java 11.
Second, users can still run a Fluss cluster on Java 11. It’s just more strongly recommended to use Java 17, as it offers better performance.

We should also update "Deploying Local Cluster" page as well.

Willingness to contribute

• I'm willing to submit a PR!

[sd4324530]

@wuchong When I submitted the code, I found that the project was still checking for Java 8, and the java8 profile config was still kept in the pom.xml. Is it possible to remove these?

[wuchong]

@sd4324530 The Fluss community still guarantees the source code compatibility with Java 8, so that users can compile the source code theirself if they need to deploy on Java8 environemnt. But the fluss community only release binary distribution compiled in Java11+. And we will drop Java8 compatibility support in the near future.

[wuchong]

@sd4324530 By the way, you reminded me that we’ve missed a key piece of documentation: how users can build Fluss with Java 8 themselves. Since Fluss officially requires Java 11 to build, but some users may still need to work with Java 8 environments (e.g., for client compatibility), it would be helpful to add a dedicated section to the Building Fluss from Source guide explaining how to do this.

We have mentioned this in the upgrade notes, but add this to building doc is also helpful. Do you want to contribute this?

https://fluss.apache.org/docs/maintenance/operations/upgrade-notes-0.8/#deprecation--end-of-support

[sd4324530]

@sd4324530 By the way, you reminded me that we’ve missed a key piece of documentation: how users can build Fluss with Java 8 themselves. Since Fluss officially requires Java 11 to build, but some users may still need to work with Java 8 environments (e.g., for client compatibility), it would be helpful to add a dedicated section to the Building Fluss from Source guide explaining how to do this.

We have mentioned this in the upgrade notes, but add this to building doc is also helpful. Do you want to contribute this?

https://fluss.apache.org/docs/maintenance/operations/upgrade-notes-0.8/#deprecation--end-of-support

@wuchong I would be happy to contribute this documentation section!

[polyzos]

I’m not sure that’s a good idea when everyone is looking at Java 17+… Java 8 is way too old to be documented IMHO

[wuchong]

@polyzos what's your idea? I think we should at-least documented Java11 is supported.