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https://issues.apache.org/jira/browse/IGNITE-27688?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Aleksandr Polovtsev reassigned IGNITE-27688:
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Assignee: Aleksandr Polovtsev
> Implement getPagesFillFactor metric
> -----------------------------------
>
> Key: IGNITE-27688
> URL: https://issues.apache.org/jira/browse/IGNITE-27688
> Project: Ignite
> Issue Type: Improvement
> Components: storage engines ai3
> Reporter: Vladimir Pligin
> Assignee: Aleksandr Polovtsev
> Priority: Major
> Labels: ignite-3
>
> h3. Background
> In Apache Ignite 2, the {{getPagesFillFactor()}} method in
> {{DataRegionMetrics}} provided a critical metric for monitoring memory
> efficiency. This metric is missing in Apache Ignite 3 and needs to be
> implemented to maintain feature parity and provide users with essential
> memory monitoring capabilities.
> The page fill factor represents the *ratio of space occupied by user and
> system data to the total size of all allocated pages* that contain this data.
> It is expressed as a value between 0.0 and 1.0.
> h3. Purpose and Use Cases
> This metric helps determine:
> # *Memory Efficiency* - How much of the allocated page memory is actually
> being used for storing data versus being wasted as empty space within pages.
> # *Fragmentation Detection* - A low fill factor indicates that data pages
> are fragmented, meaning there is significant empty space distributed across
> pages that cannot be reclaimed.
> # *Capacity Planning* - Used to estimate actual data size.
> # *Performance Tuning (and memory utilization)* - Low fill factor may
> indicate the need for page size adjustment
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