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Posted to issues@hbase.apache.org by "stack (JIRA)" <ji...@apache.org> on 2014/08/08 07:48:12 UTC
[jira] [Updated] (HBASE-11581) Add option so CombinedBlockCache L2
can be null (fscache)
[ https://issues.apache.org/jira/browse/HBASE-11581?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
stack updated HBASE-11581:
--------------------------
Labels: beginner beginners (was: )
> Add option so CombinedBlockCache L2 can be null (fscache)
> ---------------------------------------------------------
>
> Key: HBASE-11581
> URL: https://issues.apache.org/jira/browse/HBASE-11581
> Project: HBase
> Issue Type: New Feature
> Components: BlockCache
> Reporter: stack
> Assignee: stack
> Priority: Minor
> Labels: beginner, beginners
> Attachments: 11581.txt
>
>
> Add option, mostly for comparison's sake, that allows a deploy orchestrated by CombinedBlockCache such that its L1 is LruBlockCache for META blocks but DATA blocks are fetched each time (we don't try and cache them, no blockcache churn).
> In operation, i can see fscache coming around to cover the fetched DATA blocks such that if the DATA blocks fit in fscache, seeks go to zero.
> This setup for sure runs slower. Will publish numbers elsewhere. Meantime, here is a patch to enable this option.
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