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From "stack (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HBASE-2655) 2-pass compression support
Date Wed, 02 Jun 2010 15:09:41 GMT

    [ https://issues.apache.org/jira/browse/HBASE-2655?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12874603#action_12874603
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stack commented on HBASE-2655:
------------------------------

@Pirroh Ignore my questions in previous issue.  I see 'BMZ' here.

So, if bmz is not available, we'll just keep throwing runtime exceptions?

I wonder if instead we should fall back to default no-compression w/ a warn that bmz is missing.

Good stuff.

> 2-pass compression support
> --------------------------
>
>                 Key: HBASE-2655
>                 URL: https://issues.apache.org/jira/browse/HBASE-2655
>             Project: HBase
>          Issue Type: New Feature
>          Components: io
>            Reporter: Michele Catasta
>            Priority: Minor
>             Fix For: 0.21.0
>
>         Attachments: HBASE-2655.diff
>
>
> Quoting from BigTable paper: "Many clients use a two-pass custom compression scheme.
The first pass uses Bentley and McIlroy's scheme, which compresses long common strings across
a large window. The second pass uses a fast compression algorithm that looks for repetitions
in a small 16 KB window of the data. Both compression passes are very fast—they encode at
100-200 MB/s, and decode at 400-1000 MB/s on modern machines."
> The goal of this patch is to integrate a similar compression scheme in HBase.

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