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Posted to issues@ignite.apache.org by "Aleksandr Polovtcev (Jira)" <ji...@apache.org> on 2022/09/29 17:43:00 UTC

[jira] [Updated] (IGNITE-17783) Size metrics improvement part 2

     [ https://issues.apache.org/jira/browse/IGNITE-17783?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Aleksandr Polovtcev updated IGNITE-17783:
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    Description: When implementing IGNITE-17728, PagesFillFactor metrics was interpreted incorrectly. It was assumed (mostly due to non-existent javadoc) that it should reflect the ratio of occupied space to the total allocated space. It turns out that it is actually used to understand if a lot of pages are not filled completely (which may indicate an unsuitable cache entry size, for example), so it should be computed as a ratio of total occupied space (page data without fragmentation) to the space of all non-empty pages.  

> Size metrics improvement part 2
> -------------------------------
>
>                 Key: IGNITE-17783
>                 URL: https://issues.apache.org/jira/browse/IGNITE-17783
>             Project: Ignite
>          Issue Type: Improvement
>            Reporter: Aleksandr Polovtcev
>            Assignee: Aleksandr Polovtcev
>            Priority: Major
>
> When implementing IGNITE-17728, PagesFillFactor metrics was interpreted incorrectly. It was assumed (mostly due to non-existent javadoc) that it should reflect the ratio of occupied space to the total allocated space. It turns out that it is actually used to understand if a lot of pages are not filled completely (which may indicate an unsuitable cache entry size, for example), so it should be computed as a ratio of total occupied space (page data without fragmentation) to the space of all non-empty pages.  



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