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https://issues.apache.org/jira/browse/IGNITE-17728?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Aleksandr Polovtcev updated IGNITE-17728:
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Description:
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}}).
> 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
>
> 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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