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From "Alejandro Abdelnur (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-7206) Integrate Snappy compression
Date Thu, 23 Jun 2011 16:55:49 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-7206?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13053962#comment-13053962
] 

Alejandro Abdelnur commented on HADOOP-7206:
--------------------------------------------

@Taro, regarding 'loading native libs twice', if using the same classloader, loading a nativelib
a second time is a NOP, the JVM complains only if the classloader is different from the first
load.

> Integrate Snappy compression
> ----------------------------
>
>                 Key: HADOOP-7206
>                 URL: https://issues.apache.org/jira/browse/HADOOP-7206
>             Project: Hadoop Common
>          Issue Type: New Feature
>    Affects Versions: 0.21.0
>            Reporter: Eli Collins
>            Assignee: Alejandro Abdelnur
>             Fix For: 0.23.0
>
>         Attachments: HADOOP-7206-002.patch, HADOOP-7206.patch, v2-HADOOP-7206-snappy-codec-using-snappy-java.txt,
v3-HADOOP-7206-snappy-codec-using-snappy-java.txt, v4-HADOOP-7206-snappy-codec-using-snappy-java.txt,
v5-HADOOP-7206-snappy-codec-using-snappy-java.txt
>
>
> Google release Zippy as an open source (APLv2) project called Snappy (http://code.google.com/p/snappy).
This tracks integrating it into Hadoop.
> {quote}
> Snappy is a compression/decompression library. It does not aim for maximum compression,
or compatibility with any other compression library; instead, it aims for very high speeds
and reasonable compression. For instance, compared to the fastest mode of zlib, Snappy is
an order of magnitude faster for most inputs, but the resulting compressed files are anywhere
from 20% to 100% bigger. On a single core of a Core i7 processor in 64-bit mode, Snappy compresses
at about 250 MB/sec or more and decompresses at about 500 MB/sec or more.
> {quote}

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