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https://issues.apache.org/jira/browse/HBASE-5375?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Andrew Kyle Purtell closed HBASE-5375.
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> Ensure that compactions use already cached blocks but do not cache new data
> blocks
> ----------------------------------------------------------------------------------
>
> Key: HBASE-5375
> URL: https://issues.apache.org/jira/browse/HBASE-5375
> Project: HBase
> Issue Type: Test
> Components: BlockCache, Performance
> Reporter: Mikhail Gryzykhin
> Priority: Major
>
> Create a unit test to verify that compactions reuse existing cached blocks
> but do not thrash the cache with newly read blocks. Also need to verify that
> we only read every data block once, e.g. that we don't re-read the block on
> every next() operation. HBASE-1597 did not seem to include a unit test, so we
> need to add a test now. This and HBASE-4683 (the unit test that was not
> checked in) are the remaining missing pieces before we can close HBASE-3976.
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