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https://issues.apache.org/jira/browse/FLINK-37680?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Zhanghao Chen updated FLINK-37680:
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Attachment: (was: image-2025-04-15-16-31-21-369.png)
> Add subclass cache for PojoSerializer
> -------------------------------------
>
> Key: FLINK-37680
> URL: https://issues.apache.org/jira/browse/FLINK-37680
> Project: Flink
> Issue Type: Sub-task
> Components: API / Type Serialization System
> Reporter: Zhanghao Chen
> Priority: Major
> Attachments: image-2025-04-15-16-31-55-289.png,
> image-2025-04-15-16-33-11-325.png
>
>
> When the value to deserialize is an untagged subclass of the declared POJO
> type, Flink loads its acutal class every time using {{{}Class.forName{}}},
> which is inefficient. We can cache the subclasses to speed up.
> We tested on a production job, and the result is promising:
> * Flame graph before the optim (Class.forName highlighted in green):
> !image-2025-04-15-16-31-55-289.png|width=457,height=150!
> * Flame graph after the optim (Subclass cache access highlighted in green):
> !image-2025-04-15-16-33-11-325.png|width=460,height=156!
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