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From "Guozhang Wang (JIRA)" <j...@apache.org>
Subject [jira] [Created] (KAFKA-5784) Add a sensor for dropped records in window stores
Date Thu, 24 Aug 2017 22:45:00 GMT
Guozhang Wang created KAFKA-5784:
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             Summary: 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


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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