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https://issues.apache.org/jira/browse/KAFKA-5784?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Guozhang Wang resolved KAFKA-5784.
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Resolution: Fixed
Fix Version/s: 2.1.0
> Add a sensor for dropped records in window stores
> -------------------------------------------------
>
> Key: KAFKA-5784
> URL: https://issues.apache.org/jira/browse/KAFKA-5784
> Project: Kafka
> Issue Type: Bug
> Components: streams
> Reporter: Guozhang Wang
> Assignee: siva santhalingam
> Priority: Major
> Labels: newbie
> Fix For: 2.1.0
>
>
> Today when a {{put(record)}} call on a windowed store does not find the
> corresponding segment, i.e. its corresponding's window has expired, we simply
> returns a {{null}} and hence silently drops it.
> We should consider 1) add log4j entries when it happens, 2) add metrics (we
> can discuss whether it should be a processor-node level, or store level
> sensor) for such cases.
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