Apache Hadoop 生态圈软件下载地址：http://archive.apache.org/dist/hadoop/
hadoop下载地址 http://archive.apache.org/dist/hadoop/common
安装环境 虚拟机中的 CentOS 64位
需要安装软件：
jdk: jdk-7u45-linux-x64.rpm
hadoop:hadoop-2.7.2-src.tar.gz
maven:apache-maven-3.0.5-bin.tar.gz
protobuf:protobuf-2.5.0.tar.gz
在hadoop目录下有个BUILDING.txt文件，编译源码需要准备的软件，及编译方法进行了说明，可参考使用
Requirements: * Unix System * JDK 1.7+ * Maven 3.0 or later * Findbugs 1.3.9 (if running findbugs) * ProtocolBuffer 2.5.0 * CMake 2.6 or newer (if compiling native code), must be 3.0 or newer on Mac * Zlib devel (if compiling native code) * openssl devel ( if compiling native hadoop-pipes and to get the best HDFS encryption performance ) * Jansson C XML parsing library ( if compiling libwebhdfs ) * Linux FUSE (Filesystem in Userspace) version 2.6 or above ( if compiling fuse_dfs ) * Internet connection for first build (to fetch all Maven and Hadoop dependencies)
1.下载Hadoop
wget http://apache.opencas.org/hadoop/common/hadoop-2.7.2/hadoop-2.7.2-src.tar.gz
tar -zxvf hadoop-2.7.2-src.tar.gz
2.安装JDK
sudo yum install jdk-7u45-linux-x64.rpm
查看jdk安装位置：
which java
/usr/java/jdk1.7.0_45/bin/java
添加jdk到环境变量(~/.bash_profile)：
export JAVA_HOME=/usr/java/jdk1.7.0_45
export PATH=.:$JAVA_HOME/bin:$PATH
验证：
java -version
java version "1.7.0_45"
Java(TM) SE Runtime Environment (build 1.7.0_45-b18)
Java HotSpot(TM) 64-Bit Server VM (build 24.45-b08, mixed mode)
3、安装maven
wgethttp://apache.fayea.com/maven/maven-3/3.0.5/binaries/apache-maven-3.0.5-bin.tar.gz
tar -xzvf apache-maven-3.0.5-bin.tar.gz
添加maven到环境变量(~/.bash_profile):
export MAVEN_HOME=/home/hadoop/app/apache-maven-3.0.5
export PATH=.:$MAVEN_HOME/bin:$PATH
验证：
mvn -version
Apache Maven 3.0.5 (r01de14724cdef164cd33c7c8c2fe155faf9602da; 2013-02-19 05:51:28-0800)
Maven home: /home/hadoop/app/apache-maven-3.0.5
Java version: 1.7.0_45, vendor: Oracle Corporation
Java home: /usr/java/jdk1.7.0_45/jre
Default locale: en_US, platform encoding: UTF-8
OS name: "linux", version: "2.6.32-358.el6.x86_64", arch: "amd64", family: "unix"
如果设置代理，需要修改maven配置文件。
<proxy>
<id>optional</id>
<active>true</active>
<protocol>http</protocol>
<host>x.x.x.x</host>
<port>8080</port>
</proxy>
下载失败可以换镜像
<mirror>
<id>CN</id>
<name>OSChina Central</name>
<url>http://maven.oschina.net/content/groups/public/</url>
<mirrorOf>central</mirrorOf>
</mirror>
4、安装protobuf
protobuf的官方地址貌似上不了，自行下载protobuf安装包；为了编译安装protobuf，需要先gcc/gcc-c++/make
sudo apt-get install gcc
sudo apt-get install c++
sudo apt-get install cmake
sudo apt-get install gcc-c++
tar -zvxf protobuf-2.5.0.tar.gz
cd protobuf-2.5.0
./configure --prefix=/usr/local/protoc/
sudo make
sudo make install
添加protobuf到环境变量(~/.bash_profile):
export PATH=.:/usr/local/protoc/bin:$PATH
验证：
protoc --version
libprotoc 2.5.0
5、安装其他依赖
sudo yum install cmake
sudo yum install openssl-devel
sudo yum install ncurses-devel
6、编译hadoop源代码
cd ~/app/hadoop-2.7.2-src
mvn package -DskipTests -Pdist,native
编译后的代码在hadoop-2.7.2-src/hadoop-dist/target/hadoop-2.7.2下
问题：
一、编译过程中下载jar失败。
java.net.UnknownHostException: archive.apache.org
解决方式：
1.手动下载放到如下目录：
hadoop-common-project\hadoop-kms\downloads
hadoop-hdfs-project\hadoop-hdfs-httpfs\downloads
2.删除配置文件中的下载步骤：
hadoop-common-project\hadoop-kms\target\antrun\build-main.xml
<mkdir dir="downloads"/>
<get dest="downloads/apache-tomcat-6.0.41.tar.gz" skipexisting="true" verbose="true" src="http://archive.apache.org/dist/tomcat/tomcat-6/v6.0.41/bin/apache-tomcat-6.0.41.tar.gz"/>
二、Maven编译出现“java.lang.OutOfMemoryError: Java heap space”
解决方式：
.profile 中添加
export MAVEN_OPTS='-Xms256m -Xmx1024m'
三、编译出现 分配内存空间失败
扩大虚拟机内存
四、CMake Error Could NOT find OpenSSL, try to set the path to OpenSSL root folder in the
sudo apt-get install libssl-dev
