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https://issues.apache.org/jira/browse/IGNITE-5875?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Vladimir Ozerov updated IGNITE-5875:
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Fix Version/s: (was: 2.3)
> Implement memory metric that will signal about uneven distribution of pages
> between segments of durable memory
> --------------------------------------------------------------------------------------------------------------
>
> Key: IGNITE-5875
> URL: https://issues.apache.org/jira/browse/IGNITE-5875
> Project: Ignite
> Issue Type: Improvement
> Components: persistence
> Affects Versions: 2.1
> Reporter: Ivan Rakov
>
> When persistence is enabled, we split memory policy into K equal segments (K
> = concurrency level). We calculate hash of pageId to determine segment where
> page will be stored.
> Pages eviction to disk starts when segment is full. If hash function is bad
> enough, one segment can overflow when there are lots of free space, and
> evictions can start too early. We want to be able to distinguish such
> situations.
> Proposed name for metrics: pageHashFunctionScore
> Proposed formula: difference between maximum and minimum percentage of
> segment fill
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