[jira] [Updated] (IGNITE-17728) Improve data size-related metrics

["Aleksey Plekhanov (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/IGNITE-17728?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Aleksey Plekhanov updated IGNITE-17728:
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    Release Note: Fixed calculation of cache group storage size related metrics (PagesFillFactor, TotalUsedPages, TotalAllocatedPages)

> Improve data size-related metrics
> ---------------------------------
>
>                 Key: IGNITE-17728
>                 URL: https://issues.apache.org/jira/browse/IGNITE-17728
>             Project: Ignite
>          Issue Type: Improvement
>            Reporter: Aleksandr Polovtcev
>            Assignee: Aleksandr Polovtcev
>            Priority: Major
>             Fix For: 2.15
>
>          Time Spent: 20m
>  Remaining Estimate: 0h
>
> There are several problems with the current approach to metrics related to pages and sizes occupied by data:
> # {{PagesFillFactor}} implementation is strange: though its javadoc is pretty much useless, one might think that it represents a percentage of bytes occupied by data in relation to the whole available bytes. However, for some reason, it is calculated as {{(TotalSpace - FreeSpaceInDataPages) / TotalSpace}}, i.e. it does not take completely empty pages into account.
> # There exists a {{TotalUsedPages}} metric that is only available through JMX, it does not get registered in the MetricsRegistry.
> # There exists {{TotalAllocatedPages}} and {{TotalAllocatedSize}} metrics, but no {{TotalUsedSize}} metrics.
> # It would be helpful to add a metric that calculates bytes, occupied by the data (even though it can be indirectly computed using the {{PagesFillFactor}}).



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