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From "Enis Soztutar (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-11331) [blockcache] lazy block decompression
Date Wed, 10 Sep 2014 22:46:34 GMT

    [ https://issues.apache.org/jira/browse/HBASE-11331?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14129280#comment-14129280
] 

Enis Soztutar commented on HBASE-11331:
---------------------------------------

bq. Release note I'd planned, just what's in the commit message; you want more than this?
Maybe add why you would want this (X times more block cache while trading more CPU usage).


bq. There's a number of assumptions baked into HFileBlock about HeapByteArrays
Ok. Seems we may need to address that in the future. 

+1 for 0.99+. 

> [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
>             Fix For: 2.0.0, 0.98.7, 0.99.1
>
>         Attachments: HBASE-11331.00.patch, HBASE-11331.01.patch, HBASE-11331.02.patch,
HBASE-11331.03.patch, HBASE-11331.04.patch, HBASE-11331.05-0.98.patch, HBASE-11331.05.patch,
HBASE-11331.06-0.98.patch, HBASE-11331.06.patch, HBASE-11331.07-0.98.patch, HBASE-11331.07.patch,
HBASE-11331LazyBlockDecompressperfcompare.pdf, hbase-hbase-master-hor17n36.gq1.ygridcore.net.log,
lazy-decompress.02.0.pdf, lazy-decompress.02.1.json, lazy-decompress.02.1.pdf, v03-20g-045g-false.pdf,
v03-20g-045g-true-16h.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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