pulsar

Hello Folks ! -  Hope you guys are doing great. Want to know one thing, Does anyone tried Java version -  IBM’s Semeru Java runtime on pulsar cluster ?

Hey there, we did a standard `apachepulsar/pulsar-all:4.0.0` image
with
```openjdk version "17.0.16" 2025-07-15
OpenJDK Runtime Environment (build 17.0.16+8-Ubuntu-0ubuntu124.04.1)
OpenJDK 64-Bit Server VM (build 17.0.16+8-Ubuntu-0ubuntu124.04.1, mixed mode, sharing)```
No surprises there

<@U07KWFFFACR> I guess that the main difference in Semeru is the use of OpenJ9 runtime. We haven't been testing it, however I wouldn't assume any major compatibility issues. You could easily test running the complete Pulsar CI test suite by forking apache/pulsar and modifying files under `.github/workflow` and replace `corretto` with `semeru`  in `pulsar-ci.yaml` and `pulsar-ci-flaky.yaml`. After that you'd open a PR to your own fork to run a <https://pulsar.apache.org/contribute/personal-ci/|"personal CI".>

there's only 1 line to replace in each GitHub Actions workflow files:
<https://github.com/apache/pulsar/blob/2e6a8eb1f200ca687064058a101963713b896fe2/.github/workflows/pulsar-ci.yaml#L92>
<https://github.com/apache/pulsar/blob/2e6a8eb1f200ca687064058a101963713b896fe2/.github/workflows/pulsar-ci-flaky.yaml#L84>
`JDK_DISTRIBUTION: corretto` to `JDK_DISTRIBUTION: semeru`

however some JVM options in the build that runs tests might not work on Semeru, but you'll find out by running it and iterating on it.