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https://issues.apache.org/jira/browse/FLINK-9204?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Tzu-Li (Gordon) Tai resolved FLINK-9204.
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    Resolution: Duplicate

> Improve visibility of records being skipped by the `DeserializationSchema` in 
> the Kafka / Kinesis connectors
> ------------------------------------------------------------------------------------------------------------
>
>                 Key: FLINK-9204
>                 URL: https://issues.apache.org/jira/browse/FLINK-9204
>             Project: Flink
>          Issue Type: Improvement
>          Components: Kafka Connector, Kinesis Connector, Metrics
>            Reporter: Tzu-Li (Gordon) Tai
>            Priority: Minor
>             Fix For: 1.6.0
>
>
> Currently, users have to write some log for visibility if they are skipping 
> some record (by returning {{null}} from the deserialization schema).
> We should have better support for this natively in the connectors, either by 
> adding logs if {{null}} is returned by the user deserialization schema, or 
> adding counter metrics to track how many records were skipped so far.



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