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From "Doug Cutting (JIRA)" <j...@apache.org>
Subject [jira] Commented: (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, 27 Sep 2006 20:16:51 GMT
    [ http://issues.apache.org/jira/browse/HADOOP-538?page=comments#action_12438210 ] 
Doug Cutting commented on HADOOP-538:

A lot of Hadoop developers might not have the right development environment to build the native
libraries.  For example, I use Ubuntu, and had previously manually installed gcc, make and
a few other things in order to get libhdfs to compile, but to get this to compile I had to
install zlib1g-dev.  I have not yet tried to build this under cygwin, and don't even know
what packages are required there.

Do you think it would be possible to commit pre-built versions of libhadoop.so for common
platforms?  Minimally we could include 32-bit builds for cygwin and linux.  This will complicate
the process of changing these, but the alternative is to complicate the release process, since
we currently don't require non-developers to have much more than a JRE.

And/or we can fallback (with a warning) to using either Sun's implementation or jzlib when
an appropriate libhadoop.so is not available.  Then we could still decide to ship with a pre-built
version (e.g., linux only, which would be easy, since releases are all built on linux) but
things would still work fine out-of-the-box on other platforms and can be optimized by those
who wish to install the required developer tools.

A corallary to these approaches is that the generated libhadoop file name should probably
include the OS and architecture names.


> 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_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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