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new 21a25ba [SPARK-55807] Use Java 25 Compact Object Headers
21a25ba is described below
commit 21a25ba8bfb69549d3063ebfa2525cdfc7e55474
Author: Dongjoon Hyun <[email protected]>
AuthorDate: Mon Mar 2 20:06:54 2026 -0800
[SPARK-55807] Use Java 25 Compact Object Headers
### What changes were proposed in this pull request?
This PR proposes to add `-XX:+UseCompactObjectHeaders` to the
`operatorContainer.jvmArgs` in
`build-tools/helm/spark-kubernetes-operator/values.yaml`.
Since `Apache Spark K8s Operator` uses Java 25, we are ready to use this
feature.
https://github.com/apache/spark-kubernetes-operator/blob/5af667eb410e886f9180e124a14ec3241d57137c/build-tools/docker/Dockerfile#L25
### Why are the changes needed?
To use Java 25 Compact Object Headers (`-XX:+UseCompactObjectHeaders`) for
the `spark-kubernetes-operator` container. This feature is known to reduce
significantly the memory footprint of Java objects.
- https://openjdk.org/jeps/519
> In one setting, the SPECjbb2015 benchmark uses [22% less heap space and
8% less CPU
time](https://github.com/rkennke/talks/blob/master/Lilliput-FOSDEM-2025.pdf).
>
> In another setting, the number of garbage collections done by SPECjbb2015
is [reduced by
15%](https://bugs.openjdk.org/browse/JDK-8350457?focusedId=14766358&page=com.atlassian.jira.plugin.system.issuetabpanels%3Acomment-tabpanel#comment-14766358),
with both the G1 and Parallel collectors.
>
> A highly parallel JSON parser benchmark [runs in 10% less
time](https://www.reddit.com/r/scala/comments/1jptiv3/xxusecompactobjectheaders_is_your_new_turbo/?rdt=40432).
### Does this PR introduce _any_ user-facing change?
No.
### How was this patch tested?
Pass the CIs.
### Was this patch authored or co-authored using generative AI tooling?
Generated-by: `Gemini 3.1 Pro (High)` on `Antigravity`.
Closes #533 from dongjoon-hyun/SPARK-55807.
Authored-by: Dongjoon Hyun <[email protected]>
Signed-off-by: Dongjoon Hyun <[email protected]>
---
build-tools/helm/spark-kubernetes-operator/values.yaml | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/build-tools/helm/spark-kubernetes-operator/values.yaml
b/build-tools/helm/spark-kubernetes-operator/values.yaml
index 1b528e6..f997a68 100644
--- a/build-tools/helm/spark-kubernetes-operator/values.yaml
+++ b/build-tools/helm/spark-kubernetes-operator/values.yaml
@@ -41,7 +41,7 @@ operatorDeployment:
#
https://kubernetes.io/docs/concepts/scheduling-eviction/topology-spread-constraints/
topologySpreadConstraints: [ ]
operatorContainer:
- jvmArgs: "-Dfile.encoding=UTF8 -XX:+ExitOnOutOfMemoryError
-XX:+UseParallelGC -XX:InitialRAMPercentage=80 -XX:MaxRAMPercentage=80
-XX:+AlwaysPreTouch -Dio.netty.noUnsafe=true"
+ jvmArgs: "-Dfile.encoding=UTF8 -XX:+ExitOnOutOfMemoryError
-XX:+UseParallelGC -XX:InitialRAMPercentage=80 -XX:MaxRAMPercentage=80
-XX:+AlwaysPreTouch -Dio.netty.noUnsafe=true -XX:+UseCompactObjectHeaders"
env:
- name: "SPARK_USER"
value: "spark"
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