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https://issues.apache.org/jira/browse/HBASE-28176?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Wellington Chevreuil resolved HBASE-28176.
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Resolution: Fixed
Thanks for reviewing it, [~psomogyi]! Have merged into master, branch-3 and
branch-2.
> PrefetchExecutor should stop once cache reaches capacity
> --------------------------------------------------------
>
> Key: HBASE-28176
> URL: https://issues.apache.org/jira/browse/HBASE-28176
> Project: HBase
> Issue Type: Improvement
> Affects Versions: 2.6.0, 3.0.0-alpha-4, 4.0.0-alpha-1
> Reporter: Wellington Chevreuil
> Assignee: Wellington Chevreuil
> Priority: Major
> Fix For: 2.6.0, 3.0.0-beta-1, 4.0.0-alpha-1
>
>
> The prefetch executor runs a full scan on regions in the background once
> regions are opened, if the "hbase.rs.prefetchblocksonopen" property is set to
> true. However, if the store file size is much larger than the cache capacity,
> we should interrupt the prefetch once it has reached the cache capacity,
> otherwise it would just be triggering evictions of little value, since we
> don't have any sense of block priority at that point. It's better to stop the
> read, and let client reads cause the eviction of LFU blocks and cache the
> most accessed blocks.
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