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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 Tue, 14 Nov 2006 11:24:40 GMT
     [ http://issues.apache.org/jira/browse/HADOOP-538?page=all ]

Arun C Murthy updated HADOOP-538:
---------------------------------

    Attachment: HADOOP-538_20061114.patch

Here is another patch incorporating Doug's feedback...

a) Custom built libraries in build directory override the ones in lib/native, and hence there
is no prebuilt/custom distinction

b) I have reworked to account for a 'compile.native' property which controls whether the native
stuff is built/tested/packaged...
$ ant -Dcompile.native=true package    #compile native-hadoop
$ ant package                                    #no native hadoop

  I have had to define a new target: 'compile-core-classes' which replaces existing 'compile-core'
and redefined 'compile-core' as:

  <target name="compile-core" depends="compile-core-classes,compile-core-native">
   </target>

  The alternative to get 'ant -Dcompile.native=true package' or 'ant -Dcompile.native=true
test' to work was to add a 'depends="compile-native"' to every target which has a 'depends="compile-core"'
which I felt was error-prone and difficult to maintain...



> 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
>          Components: io
>    Affects Versions: 0.6.1
>            Reporter: Arun C Murthy
>         Assigned To: Arun C Murthy
>             Fix For: 0.9.0
>
>         Attachments: HADOOP-538.patch, HADOOP-538_20061005.tgz, HADOOP-538_20061011.tgz,
HADOOP-538_20061026.tgz, HADOOP-538_20061030.tgz, HADOOP-538_20061107.tgz, HADOOP-538_20061108.tgz,
HADOOP-538_20061114.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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