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From "Jonathan Gray (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-4683) Create config option to only cache index blocks
Date Thu, 27 Oct 2011 17:06:32 GMT

    [ https://issues.apache.org/jira/browse/HBASE-4683?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13137285#comment-13137285
] 

Jonathan Gray commented on HBASE-4683:
--------------------------------------

+1 on both ideas, Lars.
                
> 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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