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https://issues.apache.org/jira/browse/FLINK-25409?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17463882#comment-17463882
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Martijn Visser commented on FLINK-25409:
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[~wenlong.lwl] Yes, agreed, we're on the same page :)
> 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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