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From "Nicholas Carlini (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-6837) Support for LZMA compression
Date Tue, 10 Aug 2010 00:45:23 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-6837?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12896751#action_12896751
] 

Nicholas Carlini commented on HADOOP-6837:
------------------------------------------

I did. The average number of overflow bytes is 24. I never saw it go above 120. A quick sed/dc
script tells me the standard deviation is 18. So I'm fairly sure that I am correct in that
it will never go above 273. Trying with setting the number of fast bytes to 273 gives average
of 37 and standard deviation of 26.

> Support for LZMA compression
> ----------------------------
>
>                 Key: HADOOP-6837
>                 URL: https://issues.apache.org/jira/browse/HADOOP-6837
>             Project: Hadoop Common
>          Issue Type: Improvement
>          Components: io
>            Reporter: Nicholas Carlini
>            Assignee: Nicholas Carlini
>         Attachments: HADOOP-6837-lzma-1-20100722.non-trivial.pseudo-patch, HADOOP-6837-lzma-1-20100722.patch,
HADOOP-6837-lzma-2-20100806.patch, HADOOP-6837-lzma-3-20100809.patch, HADOOP-6837-lzma-c-20100719.patch,
HADOOP-6837-lzma-java-20100623.patch
>
>
> Add support for LZMA (http://www.7-zip.org/sdk.html) compression, which generally achieves
higher compression ratios than both gzip and bzip2.

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