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[SPARK-56128][K8S] Use Java 21-jre instead of 21 image in K8s Dockerfile - #54940
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dongjoon-hyun wants to merge 1 commit into
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[SPARK-56128][K8S] Use Java 21-jre instead of 21 image in K8s Dockerfile#54940dongjoon-hyun wants to merge 1 commit into
21-jre instead of 21 image in K8s Dockerfile#54940dongjoon-hyun wants to merge 1 commit into
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dongjoon-hyun
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Mar 21, 2026
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cc @pan3793 |
21-jre instead of 21 image in K8s Dockerfile21-jre instead of 21 image in K8s Dockerfiledongjoon-hyun
commented
Mar 21, 2026
MemberAuthor
Could you review this PR, too, @peter-toth ? |
peter-toth
approved these changes
Mar 21, 2026
dongjoon-hyun
commented
Mar 21, 2026
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Thank you, @peter-toth ! 😄 |
dongjoon-hyun
commented
Mar 21, 2026
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Merged to master for Apache Spark 4.2.0. |
pan3793
commented
Mar 23, 2026
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late lgtm |
dongjoon-hyun
commented
Mar 23, 2026
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Thank you, @pan3793 ! |
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Mar 23, 2026
…kerfile ### What changes were proposed in this pull request? This PR changes the default Java base image tag from `21` (full JDK) to `21-jre` (JRE only) in the Spark Kubernetes Dockerfile for Apache Spark 4.2.0. ### Why are the changes needed? Since Apache Spark 3.5, SPARK-44153 starts to use `jmap` for UI. - apache#41709 Since Apache Spark 4.0, we used `21` by default. - apache#45761 Since Apache Spark 4.2, we can use `21-jre` back by default because we removed `jmap` dependency. - apache#54919 The JRE image is significantly smaller than the full JDK image since it excludes development tools (compiler, debugger, etc.) that are not needed at runtime. This reduces the Spark container image size for Kubernetes deployments. ``` $ docker images IMAGE ID DISK USAGE CONTENT SIZE EXTRA azul/zulu-openjdk:21 4cfeb0cae1b1 651MB 203MB azul/zulu-openjdk:21-jre 27894d1c0e9d 461MB 114MB ``` ### Does this PR introduce _any_ user-facing change? No behavior change. In addition, users who need the full JDK can still override via `--build-arg java_image_tag=21`. ### How was this patch tested? Pass the CIs and manual review of the Dockerfile change. ### Was this patch authored or co-authored using generative AI tooling? Generated-by: Claude Code (claude-opus-4-6) Closesapache#54940 from dongjoon-hyun/SPARK-56128. Authored-by: Dongjoon Hyun <dongjoon@apache.org> Signed-off-by: Dongjoon Hyun <dongjoon@apache.org>
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What changes were proposed in this pull request?
This PR changes the default Java base image tag from
21(full JDK) to21-jre(JRE only) in the Spark Kubernetes Dockerfile for Apache Spark 4.2.0.Why are the changes needed?
Since Apache Spark 3.5, SPARK-44153 starts to use
jmapfor UI.Heap Histogramcolumn inExecutorstab #41709Since Apache Spark 4.0, we used
21by default.21instead of21-jreimage in K8s Dockerfile #45761Since Apache Spark 4.2, we can use
21-jreback by default because we removedjmapdependency.The JRE image is significantly smaller than the full JDK image since it excludes development tools (compiler, debugger, etc.) that are not needed at runtime. This reduces the Spark container image size for Kubernetes deployments.
Does this PR introduce any user-facing change?
No behavior change. In addition, users who need the full JDK can still override via
--build-arg java_image_tag=21.How was this patch tested?
Pass the CIs and manual review of the Dockerfile change.
Was this patch authored or co-authored using generative AI tooling?
Generated-by: Claude Code (claude-opus-4-6)