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https://issues.apache.org/jira/browse/KAFKA-18495?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Matthias J. Sax updated KAFKA-18495:
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Parent: KAFKA-16337
Issue Type: Sub-task (was: Improvement)
> Remove Invalid 'numberOfOpenFiles' Metric from RocksDB State Store
> -------------------------------------------------------------------
>
> Key: KAFKA-18495
> URL: https://issues.apache.org/jira/browse/KAFKA-18495
> Project: Kafka
> Issue Type: Sub-task
> Components: streams
> Reporter: Swikar Patel
> Assignee: Swikar Patel
> Priority: Major
>
> The `numberOfOpenFiles` metric in the Kafka Streams RocksDB state store
> implementation is currently invalid and should be removed.
> This metric was intended to report the approximate number of open files in
> the RocksDB instance. It was previously calculated using the RocksDB internal
> metric `NO_FILE_CLOSES`, which was removed in RocksDB version 7.9.3. Due to
> this change, the `numberOfOpenFiles` metric no longer provides accurate
> information. The current workaround is to have it always return -1, which is
> misleading.
> The `numberOfOpenFiles` metric is: Invalid It does not reflect the actual
> number of open files in RocksDB. This misleading and returning -1 can confuse
> users and monitoring systems and unnecessary it provides no useful
> information in its current state.
> h4. Proposed Solution
> This Jira issue is to implement the changes proposed in
> [KIP:1125|[https://cwiki.apache.org/confluence/display/KAFKA/KIP-1125%3A+Remove+Invalid+%27numberOfOpenFiles%27+Metric+from+RocksDB+State+Store]]
> The solution is to completely remove the `opennumberfiles` metric,
> including: * Removing the related code in `RocksDBMetricsRecorder`
> (`numberOfOpenFilesSensor`, recording logic). * Removing the
> `numberOfOpenFilesSensor` method in `RocksDBMetrics` * Updating the Kafka
> Streams documentation to reflect the metric's removal.
> h4. KIP
> KIP-1125:
> [[https://cwiki.apache.org/confluence/pages/resumedraft.action?draftId=337677055&draftShareId=6b7ff8cd-436c-4038-a7fd-de376429c1b2&;]]
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