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https://issues.apache.org/jira/browse/HBASE-4683?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jean-Daniel Cryans updated HBASE-4683:
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Attachment: HBASE-4683-v3.patch
This patch for 0.92 makes it work for me. I'm backporting a few things from
trunk, adding the method that Lars had in his patch and doing an additional
check in readBlock to make sure we always cache indexes if there's an LRU.
> Always cache index 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
>
> Attachments: 4683-v2.txt, 4683.txt, 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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