= fuse hdfs 0.20.1 繼續加油 = 

= 環境 =
 * ubuntu 9.04
 * kernel 2.6.24-24-generic (原本預設為 2.6.28-15 )
   * 請重新開機於grub 切換成第三個kernel，否則無法 modprobe fuse
 * hadoop 0.20.1 (安裝於/opt/hadoop)
 * fuse 版本
   * tarball 版為 2.7.4 
   * 而'''/lib/modules/2.6.24-24-generic/kernel/fs/fuse/fuse.ko''' 此fuse模組檔為安裝 '''linux-image-2.6.24-24-generic'''.deb時就有
 * automake 1.9.x 以上
   * sudo apt-get install automake  可得 1.10.2

 = 需求 =

 * Hadoop with compiled libhdfs.so
 * Linux kernel > 2.6.9 with fuse, which is the default or Fuse 2.7.x, 2.8.x installed. See: [http://fuse.sourceforge.net/]
 * modprobe fuse to load it
 * fuse-dfs executable (see below)
 * fuse_dfs_wrapper.sh installed in /bin or other appropriate location (see below)

 = 方法 =
 ==  1. build ==
改 build.xml 的 1046行左右，去掉 doc相關敘述，如下：
{{{
#!text
  <target name="package" depends="compile, jar, examples, tools-jar, jar-test, ant-tasks, package-librecordio"
}}}

{{{
$ cd /opt/hadoop
$ ant compile-c++-libhdfs -Dlibhdfs=1
$ ant package
$ ant compile-contrib -Dlibhdfs=1 -Dfusedfs=1
}}}


 = bug fix =
 * check java5
改 build.xml 的 1046行左右，去掉 doc相關敘述，如下：

{{{
#!text
  <target name="package" depends="compile, jar, examples, tools-jar, jar-test, ant-tasks, package-librecordio"
}}}

 * libhdfs.so does not exist: /opt/hadoop-0.20.1/build/libhdfs/libhdfs.so

{{{
mkdir /opt/hadoop-0.20.1/build/libhdfs/
ln -sf /opt/hadoop/c++/Linux-i386-32/lib/libhdfs.so /opt/hadoop-0.20.1/build/libhdfs/libhdfs.so
}}}