[jira] [Updated] (KAFKA-18495) Remove Invalid 'numberOfOpenFiles' Metric from RocksDB State Store

["Swikar Patel (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/KAFKA-18495?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Swikar Patel updated KAFKA-18495:
---------------------------------
    Summary:  Remove Invalid 'numberOfOpenFiles' Metric from RocksDB State Store  (was:  Remove Invalid 'opennumberfiles' Metric from RocksDB State Store)

>  Remove Invalid 'numberOfOpenFiles' Metric from RocksDB State Store
> -------------------------------------------------------------------
>
>                 Key: KAFKA-18495
>                 URL: https://issues.apache.org/jira/browse/KAFKA-18495
>             Project: Kafka
>          Issue Type: Improvement
>          Components: streams
>            Reporter: Swikar Patel
>            Assignee: Swikar Patel
>            Priority: Major
>
> h4. Description
> The `numberOfOpenFiles` metric in the Kafka Streams RocksDB state store implementation is currently invalid and should be removed.
> h4. Background
> 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.
> h4. Problem
> The `numberOfOpenFiles` metric is: * **Invalid:** It does not reflect the actual number of open files in RocksDB. * **Misleading:** Returning -1 can confuse users and monitoring systems. * **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/pages/resumedraft.action?draftId=337677055&draftShareId=6b7ff8cd-436c-4038-a7fd-de376429c1b2&]]. 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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