Hadoop 2.4 libhadoop.so的disabled stack guard问题
由于2.4.0默认配置的libhadoop是32位的，在64位的操作系统环境运行过程中，会提示以下错误：[*] Java HotSpot(TM) 64-Bit Server VM warning: You have loaded library /opt/hadoop-2.2.0/lib/native/libhadoop.so.1.0.0 which might have disabled stack guard. The VM will try to fix the stack guard now.
[*] It's highly recommended that you fix the library with 'execstack -c ', or link it with '-z noexecstack'.
[*] 13/11/01 10:58:59 WARN util.NativeCodeLoader: Unable to load native-hadoop library for your platform... using builtin-java classes where applicable
需要重新编译Hadoop的代码，得到适合的库文件。按以下步骤执行。
下载Hadoop 2.4.0 源代码
可以从Apache官方下载Hadoop 2.2.0的源代码，或者在以下网址下载Hadoop 2.2.0的源代码：
http://mirrors.cnnic.cn/apache/hadoop/common/hadoop-2.2.0/hadoop-2.2.0-src.tar.gz
配置编译环境
本文采用的Ubuntu 12.04.3 LTS环境，先安装编译环境：
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[*] $ yum install
[*]yum install gcc gcc-c++ kernel-devel
[*] $ yum install g++ autoconf automake libtool cmake zlib1g-dev pkg-config libssl-dev
安装 build-essential
yum groupinstall "Development Tools"
这时候需要用wget命令去网络上下载资源包
wget http://repos.fedorapeople.org/repos/dchen/apache-maven/epel-apache-maven.repo -O /etc/yum.repos.d/epel-apache-maven.repo
然后重新安装maven
[*] 安装maven
[*] yum -y install apache-maven
配置protobuf
编译过程需要使用protobuf，建议先行安装。Ubuntu仓库默认的protobuf是2.4.1版，需要最新的2.5版：
https://protobuf.googlecode.com/files/protobuf-2.5.0.tar.gz
下载解压后，执行：
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[*] $ tar xzvf protobuf-2.5.0.tar.gz
[*] $ cd protobuf-2.5.0
[*] $ ./configure --prefix=/usr
[*] $ make
[*] $ sudo make install
编译hadoop
解压进入hadoop源码目录，执行编译：
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[*] $ tar xzvf hadoop-2.2.0-src.tar.gz
[*] $ cd hadoop-2.2.0-src
[*] $ mvn package -Pdist,native -DskipTests -Dtar
编译过程中maven会自动下载依赖。编译完成后，系统会提示以下信息：
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[*] BUILD SUCCESS
[*] ------------------------------------------------
[*] Total time: 15:39.705s
[*] Finished at: Fri Nov 01 14:36:17 CST 2013
[*] Final Memory: 135M/422M
然后在以下目录可以获取编译完成的libhadoop：
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[*] hadoop-2.2.0-src/hadoop-dist/target/hadoop-2.2.0/lib
注：默认源地址下，maven下载依赖时间极长，建议使用国内源，参考《maven国内镜像配置》文档。
然后将编译的lib/native文件夹替换原本的即可。
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