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From "stack (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-11331) [blockcache] lazy block decompression
Date Thu, 12 Jun 2014 00:27:02 GMT

    [ https://issues.apache.org/jira/browse/HBASE-11331?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14028647#comment-14028647
] 

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

Looks great to me [~ndimiduk]  I am decompressing every time I read from a block rather than
as we have now where we decompress once and that is what is in the blockcache?  Will be interesting
to see how this does compared.  May show that this should be optional behavior (we give up
CPU here... we need to start winning it back elsewhere).

> [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
>
>
> 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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