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Date: Thu, 19 Jun 2014 01:48:24 +0000 (UTC)
From: "stack (JIRA)" <jira@apache.org>
To: issues@hbase.apache.org
Message-ID: <JIRA.12721519.1402954944634.5607.1403142504691@arcas>
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Subject: [jira] [Commented] (HBASE-11364) [BlockCache] Add a flag to cache
 data blocks in L1 if multi-tier cache
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    [ https://issues.apache.org/jira/browse/HBASE-11364?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14036808#comment-14036808 ] 

stack commented on HBASE-11364:
-------------------------------

One other thought is that we'd untie L1 and L2 caches and have them work independent of each other; i.e. not use CombinedBlockCache which keeps meta blocks up in L1 and data down in L2... rather we'd just have evictions from L1 go to L2 and then out of L2... Double caching is possible .. they'd work like the SlabCache setup... but that seemed to generate more GC'ing in test.  I can try testing.

> [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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