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From "stack (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-11331) [blockcache] lazy block decompression
Date Wed, 10 Sep 2014 18:09:35 GMT

    [ https://issues.apache.org/jira/browse/HBASE-11331?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14128833#comment-14128833
] 

stack commented on HBASE-11331:
-------------------------------

+1

Add to the simplification of block cache config a note that we need to unify the configuration
args?

Needs fat release note and on commit, add something to the refguide in the block cache section
else I'm afraid folks won't come across this feature.

> [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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