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https://issues.apache.org/jira/browse/KAFKA-17895?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Matthias J. Sax updated KAFKA-17895:
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Fix Version/s: 4.3.0
> Expose KeyValueStore's approximateNumEntries as a metric
> --------------------------------------------------------
>
> Key: KAFKA-17895
> URL: https://issues.apache.org/jira/browse/KAFKA-17895
> Project: Kafka
> Issue Type: Improvement
> Components: streams
> Affects Versions: 3.8.1
> Reporter: Clément MATHIEU
> Assignee: Evan Zhou
> Priority: Minor
> Labels: kip
> Fix For: 4.3.0
>
>
> Tracking the evolution of a state store's size is often useful.
> For example, we often use state store to persist pending work and set alert
> on maximum size because it means the process is falling behind.
> While KafkaStreams exposes many generic state store related or RocksDB
> specificif metrics; is does not expose KeyValueStore#approximateNumEntries
> which is a key information.
> Is it an oversight or was it a deliberate choice?
> I would be great if this metrics could be added. I assume that both in-memory
> & rocksdb implementation of approximateNumEntries are fast enought to be used
> in metrics.
> KIP-1250:
> [https://cwiki.apache.org/confluence/display/KAFKA/KIP-1250%3A+Add+metric+to+track+size+of+in-memory+state+stores]
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