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From "Jean-Daniel Cryans (Updated) (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HBASE-4683) Always cache index blocks
Date Mon, 12 Dec 2011 22:15:30 GMT

     [ https://issues.apache.org/jira/browse/HBASE-4683?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Jean-Daniel Cryans updated HBASE-4683:
--------------------------------------

    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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