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https://issues.apache.org/jira/browse/FLINK-25409?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17463861#comment-17463861
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Wenlong Lyu commented on FLINK-25409:
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hi, [~MartijnVisser], you are right about the sharing. However there is not
lookup abstraction for DataStream API/connector, we need to use FlatMapFunction
or AsyncFunction directly. LookupSource would be translate to a TableFunction
instead. If you means that we need to introduce such support, It is another
story IMO.
> 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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