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https://issues.apache.org/jira/browse/HADOOP-7206?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13053586#comment-13053586
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Alejandro Abdelnur commented on HADOOP-7206:
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@Jake
snappy-java does not load vanilla snappy SO, it loads snappy-java SO which is a
combination of snappy SO + the JNI bindings for Java.
Assuming that snappy-java splits the snappy & snappy-java native code in 2 SOs
as I suggested before in the snappy-java alias (and Taro is not convinced of
that approach, see the end of his comment) ... snappy SO would be loaded from
the system but snappy-java SO would still be loaded from the JAR. This would
mean that not avail dependencies could still happen for the snappy-java SO.
And, if you want to have a snappy-java SO build for your OS, you'd have build
it yourself but still consume the JAR that comes an external dependency.
IMO this is a big NO NO. I rather have some extra setup work until snappy SO as
commonly available with the OSes.
> 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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