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From "Arun C Murthy (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HADOOP-538) Implement a nio's 'direct buffer' based wrapper over zlib to improve performance of java.util.zip.{De|In}flater as a 'custom codec'
Date Wed, 04 Oct 2006 23:29:21 GMT
     [ http://issues.apache.org/jira/browse/HADOOP-538?page=all ]

Arun C Murthy updated HADOOP-538:

    Attachment: HADOOP-538_20061005.tgz

Here is an updated patch incorporating the following:
* Completely integrated with GNU autotools (autoconf, automake, libtool) to ease building
of native-hadoop on a wide-variety of platforms.
* Use GNU libtool to create the actual native-hadoop library to ensure platform specfic builds
and also uses java.lang.System.loadLibrary consistently to handle platform specific mappings.
* The 'fallback' feature and libhadoop-linux-i386.so provided by default as discussed here.
* Complete integration with build.xml and autotools. I have put in 3 new targets: compile-native,
clean-native and package-native which need to be called explicitly. 
* I have also ensured that no 'generated files' are ever placed in src/native directory; only
in build/ to ensure 'ant clean' works as of today. This is accomplished via 'vpath' tweaks
to the Makefiles.
* Uses -Djava.library.path (in both bin/hadoop and build.xml) to help find the native hadoop

I'd appreciate any feedback on any of the above; particularly since I'm a autotools n00bie...

I haven't tested this on cygwin yet; on my todo list. 

Doug - 
* Could you please copy the attached libhadoop-linux-i386.so in trunk/lib/native first before
attempting to build native-hadoop?
* Also, please treat this as 'almost complete' again and hold off committing it? I feel we
should skip this patch for release 0.7... thanks!

> Implement a nio's 'direct buffer' based wrapper over zlib to improve performance of java.util.zip.{De|In}flater
as a 'custom codec'
> -----------------------------------------------------------------------------------------------------------------------------------
>                 Key: HADOOP-538
>                 URL: http://issues.apache.org/jira/browse/HADOOP-538
>             Project: Hadoop
>          Issue Type: Improvement
>    Affects Versions: 0.6.1
>            Reporter: Arun C Murthy
>         Assigned To: Arun C Murthy
>             Fix For: 0.7.0
>         Attachments: HADOOP-538.patch, HADOOP-538_20061005.tgz, HADOOP-538_benchmarks.tgz
> There has been more than one instance where java.util.zip's {De|In}flater classes perform
unreliably, a simple wrapper over zlib-1.2.3 (latest stable) using java.nio.ByteBuffer (i.e.
direct buffers) should go a long way in alleviating these woes.

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