Wellington Chevreuil created HBASE-28176:
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Summary: PrefetchExecutor should stop once cache reaches capacity
Key: HBASE-28176
URL: https://issues.apache.org/jira/browse/HBASE-28176
Project: HBase
Issue Type: Improvement
Reporter: Wellington Chevreuil
Assignee: Wellington Chevreuil
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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