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https://issues.apache.org/jira/browse/HBASE-4683?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13205728#comment-13205728
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Mikhail Bautin commented on HBASE-4683:
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The new JIRA with the unit test is HBASE-5382.
> Always cache index and bloom blocks
> -----------------------------------
>
> Key: HBASE-4683
> URL: https://issues.apache.org/jira/browse/HBASE-4683
> Project: HBase
> Issue Type: New Feature
> Reporter: Lars Hofhansl
> Assignee: Mikhail Bautin
> Priority: Minor
> Fix For: 0.94.0, 0.92.0
>
> Attachments: 0001-Cache-important-block-types.patch, 4683-v2.txt,
> 4683.txt, D1695.1.patch, D807.1.patch, D807.2.patch, D807.3.patch,
> HBASE-4683-0.92-v2.patch, HBASE-4683-v3.patch
>
>
> This would add a new boolean config option: hfile.block.cache.datablocks
> Default would be true.
> Setting this to false allows HBase in a mode where only index blocks are
> cached, which is useful for analytical scenarios where a useful working set
> of the data cannot be expected to fit into the (aggregate) cache.
> This is the equivalent of setting cacheBlocks to false on all scans
> (including scans on behalf of gets).
> I would like to get a general feeling about what folks think about this.
> The change itself would be simple.
> Update (Mikhail): we probably don't need a new conf option. Instead, we will
> make index blocks cached by default.
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