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From "Greg Roelofs (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HADOOP-6837) Support for LZMA compression
Date Sat, 31 Jul 2010 03:08:20 GMT

     [ https://issues.apache.org/jira/browse/HADOOP-6837?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Greg Roelofs updated HADOOP-6837:
---------------------------------

    Attachment: HADOOP-6837-lzma-1-20100722.non-trivial.pseudo-patch

Hand-edited pseudo-patch for easier reviewing.

"New" files from the LZMA SDK were diffed against that (version 9.12), and patch-hunks containing
only trivial changes (Java package, formatting, Apache boilerplate, white space, etc.) were
replaced with a corresponding meta-comment.  Note that the 9.12 diffs were "diff -ruw" (i.e.,
ignore whitespace-only changes on single lines) and only one directory level above the relevant
code ("LZMA-SDK" vs. "LZMA").  The Java and C diffs were then combined, and the truly new
files (e.g., LzmaCodec.java) were then added back from the original patch.

3700 lines vs. original 10400+

> 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-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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