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From "Lars Hofhansl (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-11364) [BlockCache] Add a flag to cache data blocks in L1 if multi-tier cache
Date Thu, 19 Jun 2014 06:07:24 GMT

    [ https://issues.apache.org/jira/browse/HBASE-11364?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14037008#comment-14037008
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Lars Hofhansl commented on HBASE-11364:
---------------------------------------

bq. Currently, if you enable bucketcache, DATA blocks of user tables are kept in L2 (with
this option making it so you can instead have them live in L1 if you set option on your HColumnDescriptor.

I can see this both way. Since off caching is a separate option your way is better: Once off
heap cache is enabled, data goes there by default.


> [BlockCache] Add a flag to cache data blocks in L1 if multi-tier cache
> ----------------------------------------------------------------------
>
>                 Key: HBASE-11364
>                 URL: https://issues.apache.org/jira/browse/HBASE-11364
>             Project: HBase
>          Issue Type: Task
>            Reporter: stack
>            Assignee: stack
>             Fix For: 0.99.0
>
>         Attachments: 11364.txt
>
>
> This is a prerequisite for HBASE-11323 BucketCache on all the time.  It addresses a @lars
hofhansl ask that we be able to ask that for some column families, even their data blocks
get cached up in the LruBlockCache L1 tier in a multi-tier deploy as happens when doing BucketCache
(CombinedBlockCache) setups.



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