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Date: Thu, 27 Oct 2011 04:37:32 +0000 (UTC)
From: "Lars Hofhansl (Commented) (JIRA)" <jira@apache.org>
To: issues@hbase.apache.org
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Subject: [jira] [Commented] (HBASE-4683) Create config option to only cache
 index blocks
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    [ https://issues.apache.org/jira/browse/HBASE-4683?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13136766#comment-13136766 ] 

Lars Hofhansl commented on HBASE-4683:
--------------------------------------

As a separate issue... index blocks could be treated with MEMORY priority in the LRU cache.

                
> Create config option to only cache index blocks
> -----------------------------------------------
>
>                 Key: HBASE-4683
>                 URL: https://issues.apache.org/jira/browse/HBASE-4683
>             Project: HBase
>          Issue Type: New Feature
>            Reporter: Lars Hofhansl
>            Priority: Minor
>             Fix For: 0.94.0
>
>
> 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.

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