diff --git a/2015/04/08/hello-world/index.html b/2015/04/08/hello-world/index.html new file mode 100644 index 0000000..7e1ba82 --- /dev/null +++ b/2015/04/08/hello-world/index.html @@ -0,0 +1,212 @@ + + + + + + Hello World | Why is Mapic + + + + + + + + + + + + + + + + + + + + + + + + +
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Hello World

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2015/04/05-2015/04/08

博客诞生之初！

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这几天适逢清明节，一个人在实验室安安静静的学到了很多东西，在此感谢Gavin。正是看到他关于Hexo的介绍，才萌生了建博客的念头。还有Zippera的不吝指导，包括他博客的教程以及通过QQ的交谈，可以说没有他的帮助我不会这么顺利。

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从今开始，我会尝试用博客记录我的成长历程，见证我成为大牛的点点滴滴！

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+ + + + + + + + + + + + + + \ No newline at end of file diff --git "a/2015/04/09/Ubuntu14.10\344\270\213\351\205\215\347\275\256java\347\216\257\345\242\203\345\217\230\351\207\217/index.html" "b/2015/04/09/Ubuntu14.10\344\270\213\351\205\215\347\275\256java\347\216\257\345\242\203\345\217\230\351\207\217/index.html" new file mode 100644 index 0000000..bd52b1c --- /dev/null +++ "b/2015/04/09/Ubuntu14.10\344\270\213\351\205\215\347\275\256java\347\216\257\345\242\203\345\217\230\351\207\217/index.html" @@ -0,0 +1,236 @@ + + + + + + Ubuntu14.10配置java环境变量 | Why is Mapic + + + + + + + + + + + + + + + + + + + + + + + + +
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Ubuntu14.10配置java环境变量

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  1. 下载最新的jdk8安装

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    2. +

  2. 解压jdk-8u40-linux-x64.gz(64位版本，相信32位的现在已经很少了吧)，解压后放置在/opt下

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    $sudo tar -zxvf jdk-8u40-linux-x64.gz -C /opt
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  3. 配置环境变量

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    $sudo gedit ~/.bashrc
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  4. 在末尾处加入一下内容

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    export JAVA_HOME=/opt/jdk1.8.0_40
    export JRE_HOME=${JAVA_HOME}/jre
    export CLASSPATH=.:${JAVA_HOME}/lib:${JRE_HOME}/lib
    export PATH=${JAVA_HOME}/bin:$PATH
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  5. 配置默认JDK
    由于部分linux已经自带了JDK，所以我们需要设置刚刚安装好的JDK来作为默认JDK，可以进行下面的配置

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    $sudo update-alternatives --install /usr/bin/java java /opt/jdk1.8.0_40/bin/java 300
    $sudo update-alternatives --install /usr/bin/javac javac /opt/jdk1.8.0_40/bin/javac 300
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  6. 测试
    启动终端，输入以下命令

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如果显示java的版本号1.8.0则环境变量配置成功

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+ + + + + + + + + + + + + + \ No newline at end of file diff --git "a/2015/04/09/Ubuntu14.10\345\256\211\350\243\205hadoop/index.html" "b/2015/04/09/Ubuntu14.10\345\256\211\350\243\205hadoop/index.html" new file mode 100644 index 0000000..81f4d72 --- /dev/null +++ "b/2015/04/09/Ubuntu14.10\345\256\211\350\243\205hadoop/index.html" @@ -0,0 +1,272 @@ + + + + + + Ubuntu14.10安装hadoop | Why is Mapic + + + + + + + + + + + + + + + + + + + + + + + + +
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Ubuntu14.10安装hadoop

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配置java环境变量

参见上一篇文章。

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准备工作

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  1. 创建hadoop组和hadoop用户,并将hadoop用户加入hadoop组

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    $sudo addgroup hadoop
    $sudo adduser -ingroup hadoop hadoop
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    回车后会提示输入新的UNIX密码，这是新建用户hadoop的密码。密码不回显，输入之后会要求确认一次。切记这一步不能回车跳过，否则无法登陆创建的用户。密码确认之后还要输入其他一些个人信息，这里可以一直回车跳过，最后确认所有信息正误，输入Y之后回车。

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  2. 为hadoop用户添加权限

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    $sudo gedit /etc/sudoers
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    在打开的sudoers文件中，给hadoop用户赋予和root用户同样的权限。在root ALL=(ALL:ALL) ALL这一行下面添加hadoop ALL=(ALL:ALL) ALL

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  3. 使用hadoop用户身份登陆Ubuntu系统
    4. +

  4. 安装ssh

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    $sudo apt-get install openssh-server
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    安装完成后，启动服务：

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    查看服务是否正确启动：

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    ps -e | grep ssh
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    我们将会看到终端打印出sshd的进程

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    5. +
  5. 设置免密码登录，生成私钥和公钥
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    6. +
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安装hadoop1.2.1

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  1. 官网下载hadoop1.2.1
    2. +

  2. 安装hadoop
    解压hadoop至/usr/local目录下：

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    $sudo tar zxvf hadoop-1.2.1.tar.gz -C /usr/local/
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    赋予用户对该文件夹足够的权限：

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    $sudo chmod 777 /usr/local/hadoop-1.2.1
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    配置环境变量

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    $sudo gedit ~/.bashrc
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    在文件的末尾添加环境变量：

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    #HADOOP VARIABLES START
    export JAVA_HOME=/opt/jdk1.8.0_40/
    export HADOOP_HOME=/usr/local/hadoop-1.2.1
    export PATH=$PATH:$HADOOP_HOME/bin:$JAVA_HOME/bin
    export CLASSPATH=$JAVA_HOME/lib:.
    #HADOOP VARIABLES END
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    执行下面的命令使添加的环境变量生效：

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    $source ~/.bashrc
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    3. +

  3. 配置hadoop-env.sh文件
    执行下面的命令：

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    $sudo gedit /usr/local/hadoop-1.2.1/conf/hadoop-env.sh
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    找到JAVA_HOME变量，修改此变量如下：

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    4. +

  4. 配置core-site.xml文件
    填写以下内容：

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    <configuration>
        <property>
            <name>hadoop.tmp.dir</name>
            <value>/home/hadoop/hadoop-1.2.1/tmp</value>
            <description>Abase for other temporary directories.
    	</description>
        </property>
        <property>
            <name>fs.default.name</name>
            <value>hdfs://localhost:9000</value>
        </property>
    </configuration>
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  5. 配置hdfs-site.xml文件

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    <configuration>
    <property>
        <name>dfs.name.dir</name>
        <value>/home/hadoop/hadoop-1.2.1/dfs/name</value>
        <description>Path on the local filesystem where the NameNode stores the namespace and transactions logs persistently.</description>
    </property>
     
    <property>
        <name>dfs.data.dir</name>
        <value>/home/hadoop/hadoop-1.2.1/dfs/data</value>
        <description>Comma separated list of paths on the local filesystem of a DataNode where it should store its blocks.</description>
    </property>
    <property>
        <name>dfs.replication</name>
        <value>1</value>
    </property>
    </configuration>
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  6. 配置mapred-site.xml文件

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    <configuration>
    <property>
        <name>mapred.job.tracker</name>
        <value>localhost:9001</value>
        <description>Host or IP and port of JobTracker.</description>
    </property>
    </configuration>
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    7. +

  7. 配置masters文件
    填写：

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  8. 配置slaves文件
    填写：

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+ + + + + + + + + + + + + + \ No newline at end of file diff --git "a/2015/04/09/hadoop\350\277\220\350\241\214\344\270\216wordcount\347\250\213\345\272\217\346\265\213\350\257\225/index.html" "b/2015/04/09/hadoop\350\277\220\350\241\214\344\270\216wordcount\347\250\213\345\272\217\346\265\213\350\257\225/index.html" new file mode 100644 index 0000000..0ba1e28 --- /dev/null +++ "b/2015/04/09/hadoop\350\277\220\350\241\214\344\270\216wordcount\347\250\213\345\272\217\346\265\213\350\257\225/index.html" @@ -0,0 +1,231 @@ + + + + + + Hadoop安装与WordCount程序测试 | Why is Mapic + + + + + + + + + + + + + + + + + + + + + + + + +
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Hadoop安装与WordCount程序测试

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  1. 首次运行hadoop前需格式化HDFS文件系统，命令如下：

    格式化成功将会显示如下提示：
    2. +
  2. 运行hadoop，命令及运行情况如下：
    3. +
  3. 测试数据说明
    测试数据来自hadoop官网的6个网页文件（html），每一个网页文件都具有大量的英文单词。文件如下：
    4. +
  4. 运行WordCount程序
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    将本地的6个html文件拷贝进HDFS文件系统，命令如下：

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    运行hadoop自带的wordcount程序，命令如下：

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    运行过程如下：

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  5. 查看HDFS中的结果
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  6. 将结果从HDFS拷贝到本地磁盘
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  7. 查看结果，test-out会产生3个文件或者文件夹，如下:

    中间一个part-r-00000的文件是我们需要的结果，它是以词与词频的形式为我们呈现的，如下所示（截取部分）：
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  8. 注意事项
    在启动hadoop之后偶尔发现在HDFS中不能删除文件，提示namenode safe mode，这时候需要hadoop dfsadmin –safemode leave取消safe mode。
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+ + + + + + + + + + + + + + \ No newline at end of file diff --git "a/2015/06/05/Linux\344\270\213capget\344\270\216capset\347\263\273\347\273\237\350\260\203\347\224\250/index.html" "b/2015/06/05/Linux\344\270\213capget\344\270\216capset\347\263\273\347\273\237\350\260\203\347\224\250/index.html" new file mode 100644 index 0000000..bc75ed7 --- /dev/null +++ "b/2015/06/05/Linux\344\270\213capget\344\270\216capset\347\263\273\347\273\237\350\260\203\347\224\250/index.html" @@ -0,0 +1,227 @@ + + + + + + Linux下capget和capset系统调用详解 | Why is Mapic + + + + + + + + + + + + + + + + + + + + + + + + +
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Linux下capget和capset系统调用详解

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吐槽

居然被陈某人拉进了SELinux小组，只能说郁闷

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权能机制

linux从2.1开始加入权能机制，从此，访问控制的时候不再是判断主体的euid（有效用户ID），而是判断主体是否具有某一个权能。3.10版本的权能已经多达37个。目前只有root用户完整的拥有这些权能，且只有root可以赋予其他进程某些权能，这就是通过capget与capset实现的。

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原型

capset与capget系统调用位于内核kernel/include/linux/syscalls.h系统调用表中，其原型为：

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  1. asmlinkage long sys_capget(cap_user_header_t header,cap_user_data_t dataptr);
    2. +
  2. asmlinkage long sys_capset(cap_user_header_t header,const cap_user_data_t data);
    3. +
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功能

capget用来获得进程的权能，capset用来设置进程的权能。

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相关数据结构

typedef struct __user_cap_header_struct {
+    __u32 version;
+    int pid;
+} __user *cap_user_header_t;
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2015/4

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2015/6

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2015

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mapicccy

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男人有实力，才有魅力

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- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - diff --git a/css/font/fontawesome-webfont.eot b/css/font/fontawesome-webfont.eot new file mode 100644 index 0000000..89070c1 Binary files /dev/null and b/css/font/fontawesome-webfont.eot differ diff --git a/css/font/fontawesome-webfont.svg b/css/font/fontawesome-webfont.svg new file mode 100644 index 0000000..1245f92 --- /dev/null +++ b/css/font/fontawesome-webfont.svg @@ -0,0 +1,255 @@ + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + \ No newline at end of file diff --git a/css/font/fontawesome-webfont.ttf b/css/font/fontawesome-webfont.ttf new file mode 100644 index 0000000..c17e9f8 Binary files /dev/null and b/css/font/fontawesome-webfont.ttf differ diff --git a/css/font/fontawesome-webfont.woff b/css/font/fontawesome-webfont.woff new file mode 100644 index 0000000..09f2469 Binary files /dev/null and b/css/font/fontawesome-webfont.woff differ diff --git a/fancybox/blank.gif b/fancybox/blank.gif new file mode 100644 index 0000000..35d42e8 Binary files /dev/null and b/fancybox/blank.gif differ diff --git a/fancybox/fancybox_loading.gif b/fancybox/fancybox_loading.gif new file mode 100644 index 0000000..a03a40c Binary files /dev/null and b/fancybox/fancybox_loading.gif differ diff --git a/fancybox/fancybox_loading@2x.gif b/fancybox/fancybox_loading@2x.gif new file mode 100644 index 0000000..9205aeb Binary files /dev/null and b/fancybox/fancybox_loading@2x.gif differ diff --git a/fancybox/fancybox_overlay.png b/fancybox/fancybox_overlay.png new file mode 100644 index 0000000..a439139 Binary files /dev/null and b/fancybox/fancybox_overlay.png differ diff --git a/fancybox/fancybox_sprite.png b/fancybox/fancybox_sprite.png new file mode 100644 index 0000000..fd8d5ca Binary files /dev/null and b/fancybox/fancybox_sprite.png differ diff --git a/fancybox/fancybox_sprite@2x.png b/fancybox/fancybox_sprite@2x.png new file mode 100644 index 0000000..d0e4779 Binary files /dev/null and b/fancybox/fancybox_sprite@2x.png differ diff --git a/fancybox/jquery.fancybox.css b/fancybox/jquery.fancybox.css new file mode 100644 index 0000000..367890a --- /dev/null +++ b/fancybox/jquery.fancybox.css @@ -0,0 +1,274 @@ +/*! fancyBox v2.1.5 fancyapps.com | fancyapps.com/fancybox/#license */ +.fancybox-wrap, +.fancybox-skin, +.fancybox-outer, +.fancybox-inner, +.fancybox-image, +.fancybox-wrap iframe, +.fancybox-wrap object, +.fancybox-nav, +.fancybox-nav span, +.fancybox-tmp +{ + padding: 0; + margin: 0; + border: 0; + outline: none; + vertical-align: top; +} + +.fancybox-wrap { + position: absolute; + top: 0; + left: 0; + z-index: 8020; +} + +.fancybox-skin { + position: relative; + background: #f9f9f9; + color: #444; + text-shadow: none; + -webkit-border-radius: 4px; + -moz-border-radius: 4px; + border-radius: 4px; +} + +.fancybox-opened { + z-index: 8030; +} + +.fancybox-opened .fancybox-skin { + -webkit-box-shadow: 0 10px 25px rgba(0, 0, 0, 0.5); + -moz-box-shadow: 0 10px 25px rgba(0, 0, 0, 0.5); + box-shadow: 0 10px 25px rgba(0, 0, 0, 0.5); +} + +.fancybox-outer, .fancybox-inner { + position: relative; +} + +.fancybox-inner { + overflow: hidden; +} + +.fancybox-type-iframe .fancybox-inner { + -webkit-overflow-scrolling: touch; +} + +.fancybox-error { + color: #444; + font: 14px/20px "Helvetica Neue",Helvetica,Arial,sans-serif; + margin: 0; + padding: 15px; + white-space: nowrap; +} + +.fancybox-image, .fancybox-iframe { + display: block; + width: 100%; + height: 100%; 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mapicccy

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男人有实力，才有魅力

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- - - - - 发表于 - - - - - - - - - - - - - Disqus： - - - - - - -
- - - - - 本文字数： - 13k - - - - - - 阅读时长 ≈ - 22 分钟 - - -
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Ftrace探析

Ftrace原理

ftrace（function tracer）支持全局trace，可以对内核和模块全局函数进行跟踪。tracer为编译器在编译时自动插入代码段的一条指令，程序在运行时能够利用这条指令实现跳转。目前Linux 5.10支持的tracer种类有8种，分别为hwlat、blk、function_graph、wakeup_dl、wakeup_rt、wakeup、function、nop，可以通过/sys/kernel/debug/tracing/available_tracers查看。

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- - © 2019 – - 2022 - - - - mapicccy - | - - - - 13k - | - - - - 22 分钟 -
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Linux

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+ + © 2015 mapicc + +
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hadoop

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java

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+ + © 2015 mapicc + +
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