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https://issues.apache.org/jira/browse/IGNITE-10997?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16801858#comment-16801858
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Denis Chudov commented on IGNITE-10997:
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Now DataRegionMetrics has new property: getTotalUsedPages. It's another metric,
but is also useful for this case: empty pages can be calculated as allocated
pages minus used pages.
> Add new property to DataRegionMetrics: empty pages count in reuseList.
> ----------------------------------------------------------------------
>
> Key: IGNITE-10997
> URL: https://issues.apache.org/jira/browse/IGNITE-10997
> Project: Ignite
> Issue Type: Improvement
> Reporter: Ivan Daschinskiy
> Assignee: Denis Chudov
> Priority: Major
> Fix For: 2.8
>
>
> In order to estimate available space in data region, new property should be
> added in dataregions metrics -- empty pages count from
> org.apache.ignite.internal.processors.cache.persistence.freelist.AbstractFreeList#emptyDataPages
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