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From "Nick Dimiduk (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HBASE-11331) [blockcache] lazy block decompression
Date Wed, 10 Sep 2014 22:56:34 GMT

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

Nick Dimiduk updated HBASE-11331:
    Release Note: 
When hbase.block.data.cachecompressed=true, DATA (and ENCODED_DATA) blocks are cached in the
BlockCache in their on-disk format. This is different from the default behavior, which decompresses
and decrypts a block before caching.

For a region server hosting more data than fits into cache, enabling this feature with SNAPPY
compression results in 50% increase in throughput and 30% improvement in mean latency while
increasing GC by 80% and increasing overall CPU load by 2%.

> [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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