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From "Tatu Saloranta (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-6389) Add support for LZF compression
Date Wed, 28 Jul 2010 06:27:20 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-6389?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12893076#action_12893076
] 

Tatu Saloranta commented on HADOOP-6389:
----------------------------------------

Although I have not worked on integration, I have been able to get a simple reusable LZF block
codec published, available from github (http://github.com/ning/compress), and main Maven repo
(group com.ning, artifact compress-lzf). So at least simple part (codec itself) is ready for
anyone with enough familiarity to handle full integration, ideally supporting access at least
at block level (can read starting from block boundaries; blocks are byte-aligned, contain
compress and uncompressed block lengths to support somewhat efficient skipping of blocks).


> Add support for LZF compression
> -------------------------------
>
>                 Key: HADOOP-6389
>                 URL: https://issues.apache.org/jira/browse/HADOOP-6389
>             Project: Hadoop Common
>          Issue Type: New Feature
>          Components: io
>            Reporter: Tatu Saloranta
>
> (note: related to [HADOOP-4874])
> As per Doug's earlier comments, LZF does indeed look like a good compressor candidate
for fast compression/decompression, good enough compression rate.
> From my testing it seems at least twice as fast at compression, and somewhat faster for
decompressing than gzip.
> Code from [http://h2database.googlecode.com/svn/trunk/h2/src/main/org/h2/compress/] is
applicable, and I have tested it with json data.
> I hope to have more to spend on this in near future, but if someone else gets to this
first that'd be good too.

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