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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