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https://issues.apache.org/jira/browse/FLINK-25409?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17493621#comment-17493621
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Yuan Zhu commented on FLINK-25409:
----------------------------------

Hi, all. Sorry for my late reply. As discussion before, I make a brief design: 

[https://docs.google.com/document/d/1L2eo7VABZBdRxoRP_wPvVwuvTZOV9qrN9gEQxjhSJOc/edit?usp=sharing]

> Add cache metric to LookupFunction
> ----------------------------------
>
>                 Key: FLINK-25409
>                 URL: https://issues.apache.org/jira/browse/FLINK-25409
>             Project: Flink
>          Issue Type: Improvement
>          Components: Table SQL / Ecosystem
>            Reporter: Yuan Zhu
>            Priority: Major
>
> Since we encounter performance problem when lookup join in production env 
> frequently, adding metrics to monitor Lookup function cache is very helpful 
> to troubleshoot.



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