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Date: Thu, 15 Dec 2011 18:28:30 +0000 (UTC)
From: "Jean-Daniel Cryans (Resolved) (JIRA)" <jira@apache.org>
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Subject: [jira] [Resolved] (HBASE-4683) Always cache index and bloom blocks
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     [ https://issues.apache.org/jira/browse/HBASE-4683?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Jean-Daniel Cryans resolved HBASE-4683.
---------------------------------------

      Resolution: Fixed
    Hadoop Flags: Reviewed

Committed to branch and trunk, thanks for the quick work Mikhail!
                
> 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: 0.92.0, 0.94.0
>
>         Attachments: 0001-Cache-important-block-types.patch, 4683-v2.txt, 4683.txt, 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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