[jira] [Commented] (HBASE-4683) Always cache index blocks

["Jean-Daniel Cryans (Commented) (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HBASE-4683?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13167699#comment-13167699 ] 

Jean-Daniel Cryans commented on HBASE-4683:
-------------------------------------------

Mikhail, this line seems only to be used for bloom filters:

bq. cacheBlock &= cacheConf.shouldCacheDataOnRead().

What about the other meta blocks?
                
> 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: Lars Hofhansl
>            Priority: Minor
>             Fix For: 0.94.0
>
>         Attachments: 4683-v2.txt, 4683.txt
>
>
> 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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