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

["Phabricator (Commented) (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HBASE-4683?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13168162#comment-13168162 ] 

Phabricator commented on HBASE-4683:
------------------------------------

lhofhansl has commented on the revision "[jira] [HBASE-4683] Always cache index and bloom blocks".

  Looks good to me generally. The metric changes are unrelated, though. Correct?

INLINE COMMENTS
  src/main/java/org/apache/hadoop/hbase/regionserver/metrics/SchemaConfigured.java:192 This is an unrelated change it seems
  src/main/java/org/apache/hadoop/hbase/regionserver/metrics/SchemaConfigured.java:248 another unrelated change

REVISION DETAIL
  https://reviews.facebook.net/D807

                
> 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: 0.94.0
>
>         Attachments: 4683-v2.txt, 4683.txt, D807.1.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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