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From "Nick Dimiduk (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HBASE-11331) [blockcache] lazy block decompression
Date Fri, 22 Aug 2014 21:56:12 GMT

     [ https://issues.apache.org/jira/browse/HBASE-11331?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Nick Dimiduk updated HBASE-11331:
---------------------------------

    Attachment: hbase-hbase-master-hor17n36.gq1.ygridcore.net.log

re: hbase-hbase-master-hor17n36.gq1.ygridcore.net.log

bq. I've tripped my assertions around blockcache count metrics.

False alarm. There is a case when the reported metric is greater than 5% different from the
actual map size, but it happened while executing the shutdown hooks, not while the job was
running. Attaching the log file in case anyone is curious.

> [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-11331.04.patch, HBASE-11331.05.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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