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[SPARK-56601][K8S] Promote KubernetesClientUtils to Stable#55513

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[SPARK-56601][K8S] Promote KubernetesClientUtils to Stable#55513
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@dongjoon-hyun dongjoon-hyun commented Apr 23, 2026

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What changes were proposed in this pull request?

This PR aims to promote KubernetesClientUtils from @Unstable to @Stable API.

Why are the changes needed?

KubernetesClientUtils is a @DeveloperApi utility used by both Spark's
internal K8s submission path and the Spark K8s Operator. It was introduced in
Apache Spark 3.1.0 (SPARK-30985) and becomes DeveloperAPI at Spark 4.1.0.

Since 3.1.0, its public surface has remained stable for multiple releases. Promoting it to @Stable signals this stability to downstream users like the Spark K8s Operator.

Does this PR introduce any user-facing change?

No, this is an annotation-only change (API stability signaling). No behavior
change.

How was this patch tested?

Pass the CIs.

Was this patch authored or co-authored using generative AI tooling?

Generated-by: Claude Opus 4.7

@dongjoon-hyun dongjoon-hyun changed the title [SPARK-56601] Promote KubernetesClientUtils to Stable [SPARK-56601][K8S] Promote KubernetesClientUtils to Stable Apr 23, 2026
@dongjoon-hyun

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Could you review this PR too, @peter-toth ?

@dongjoon-hyun

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Thank you, @peter-toth .

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