Hi everyone, Some of you remember that Paulo raised a concern around warnings about missing modules on startup during the 5.0 alpha2 voting.[1] We opened the ticket CASSANDRA-19001. The problem turned out to be not a 5.0 one. Those modules are missing when we run Cassandra on JRE. Those warnings happened to appear only when using Java 17. However, the modules are also missing with Java 11…
jdk. attach is needed for nodetool sjk hh. When someone tries to use that command, they get an error that JDK is expected. There isn't anything to do about that here. Now, the potential issue comes with jdk.compiler. It was added for Chronicle queues as per this article - https://chronicle.software/chronicle-support-java-17/ I tried contacting the project to understand the implications of missing this module - errors expected/degraded performance. I did not get any response so far. More details on the ticket. (CASSANDRA-19001) In the meantime, a discussion of whether we want to recommend using JRE and not JDK started on the ticket. For more details, please check CASSANDRA-19001. FQL and Audit Logging use Chronicle Queues. Our CI does not show any issues when I remove the add-opens/add-exports for jdk.compiler, but that doesn't mean there is no hidden issue, as we all know. Naturally, I have a few questions for you: 1) Does Anyone have more experience with Chronicle queues and have some thoughts/advice to share? Is it worth it to dig more into the Chronicle repos ourselves? 2) Do we want to recommend people to switch to JDK? Or should we warn that JDK is recommended on startup if someone has enabled Audit Logging/FQL and is using JRE? These are some of the options so far mentioned on CASSANDRA-19001. What we decide will also influence the response to 1) (Is it worth it to dig more into the Chronicle repos ourselves?). A few notes: - our CI tests with JDK - our packages check JRE - the official docker image has used JRE for years - our docs are inconsistent when mentioning JDK and JRE in different places https://lists.apache.org/thread/sb3qfmgfx9hpbm58jfo83qsdsxqpqscx
