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https://issues.apache.org/jira/browse/IGNITE-7489?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16335658#comment-16335658
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Andrew Mashenkov commented on IGNITE-7489:
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Seems, FillFactor metric shows average occupied space in some set of pages.
This set of pages doesn't contains full-filled (100%) pages and the metric
looks useless as we can't know size of the set.
> Weird FillFactor metric fluctuation.
> ------------------------------------
>
> Key: IGNITE-7489
> URL: https://issues.apache.org/jira/browse/IGNITE-7489
> Project: Ignite
> Issue Type: Bug
> Affects Versions: 2.1, 2.2, 2.3
> Reporter: Andrew Mashenkov
> Priority: Major
> Attachments: FillFactorTest.java
>
>
> PFA a repro.
> There is 2 node grid with no persistence configure. Topology is stable.
> Cache is populated with unique keys (no updates) and observe allocated data
> pages metric grows constantly as expected.
> Used memory is calculated as PhysicalMemoryPages*PageSize*FillFactor and
> expected it will be constantly grows (or may be with a small error).
> But the error look too large, used memory (and FillFactor as well) may 2-10+
> time differs.
>
> E.g. allocated pages, fillFactor, usedMem (bytes):
> node-0: 13789 0.851563 48096032
> node-1: 14447 0.781250 46230400
> In next second:
> node-0: 13958 0.039063 2233280
> node-1: 14624 0.347656 20824576
>
>
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