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Posted to jira@kafka.apache.org by "Matthias J. Sax (Jira)" <ji...@apache.org> on 2026/06/07 20:13:00 UTC
[jira] [Updated] (KAFKA-18495) Remove Invalid 'numberOfOpenFiles' Metric from RocksDB State Store
[ https://issues.apache.org/jira/browse/KAFKA-18495?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Matthias J. Sax updated KAFKA-18495:
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Labels: (was: kip)
> 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
> Affects Versions: 4.0.0
> Reporter: Swikar Patel
> Priority: Blocker
> Fix For: 5.0.0
>
>
> h1. *THIS TICKET CANNOT BE WORKED ON, UNTIL WE DO APACHE KAFKA 5.0 RELEASE.*
> 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 9.7.3. 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: Remove Invalid 'numberOfOpenFiles' Metric from RocksDB State Store|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.
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