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https://issues.apache.org/jira/browse/FLINK-38954?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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zhangxing updated FLINK-38954:
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Summary: Flink Benchmark Performance regression After Upgrading JDK
Versions of Flink Engine and User Program (was: Flink Benchmark Score
Decreases After Upgrading JDK Versions of Flink Engine and User Program)
> Flink Benchmark Performance regression After Upgrading JDK Versions of Flink
> Engine and User Program
> ----------------------------------------------------------------------------------------------------
>
> Key: FLINK-38954
> URL: https://issues.apache.org/jira/browse/FLINK-38954
> Project: Flink
> Issue Type: Bug
> Components: Benchmarks
> Affects Versions: 1.18.1
> Reporter: zhangxing
> Priority: Blocker
> Attachments: image-2026-01-21-15-56-21-514.png
>
>
> For historical compatibility reasons, I compiled Flink 1.18.1 using JDK 8.
> Now, I intend to upgrade the JDK version (to either 11 or 17) and want to
> test if the performance improves after the upgrade—this will help me
> determine whether the upgrade is meaningful. I chose to use the [Flink
> Benchmark|https://github.com/apache/flink-benchmarks/tree/master] project for
> testing; however, after conducting the tests, I found that many metrics
> actually *decreased* following the JDK upgrade. I also checked the metrics in
> [Flink Speed Center|http://flink-speed.xyz/] and noticed the same issue (as
> shown in the figure below).
> !image-2026-01-21-15-56-21-514.png|width=632,height=261!
> Is this situation normal? Or is my testing approach correct?
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