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https://issues.apache.org/jira/browse/FLINK-25409?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17463700#comment-17463700
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Martijn Visser commented on FLINK-25409:
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The JDBC connector still needs to be ported to the new Source API (FLIP-27
https://cwiki.apache.org/confluence/display/FLINK/FLIP-27%3A+Refactor+Source+Interface)
and Sink API (FLIP-143
https://cwiki.apache.org/confluence/display/FLINK/FLIP-143%3A+Unified+Sink+API).
Those interfaces also have implications to the metrics, as explained on
FLIP-33
https://cwiki.apache.org/confluence/display/FLINK/FLIP-33%3A+Standardize+Connector+Metrics
and
I can imagine refactoring the connector to these interfaces also has
implications on this ticket. WDYT?
> 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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