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Date: Thu, 21 Aug 2014 17:19:12 +0000 (UTC)
From: "Nick Dimiduk (JIRA)" <jira@apache.org>
To: issues@hbase.apache.org
Message-ID: <JIRA.12720693.1402520063518.2941.1408641552895@arcas>
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Subject: [jira] [Commented] (HBASE-11331) [blockcache] lazy block
 decompression
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    [ https://issues.apache.org/jira/browse/HBASE-11331?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14105622#comment-14105622 ] 

Nick Dimiduk commented on HBASE-11331:
--------------------------------------

I'm now investigating those heart-beat looking GC spikes in the compressed=true graphs.

> [blockcache] lazy block decompression
> -------------------------------------
>
>                 Key: HBASE-11331
>                 URL: https://issues.apache.org/jira/browse/HBASE-11331
>             Project: HBase
>          Issue Type: Improvement
>          Components: regionserver
>            Reporter: Nick Dimiduk
>            Assignee: Nick Dimiduk
>         Attachments: HBASE-11331.00.patch, HBASE-11331.01.patch, HBASE-11331.02.patch, HBASE-11331.03.patch, HBASE-11331LazyBlockDecompressperfcompare.pdf, lazy-decompress.02.0.pdf, lazy-decompress.02.1.json, lazy-decompress.02.1.pdf, v03-20g-045g-false.pdf, v03-20g-045g-true.pdf
>
>
> Maintaining data in its compressed form in the block cache will greatly increase our effective blockcache size and should show a meaning improvement in cache hit rates in well designed applications. The idea here is to lazily decompress/decrypt blocks when they're consumed, rather than as soon as they're pulled off of disk.
> This is related to but less invasive than HBASE-8894.


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