wiki:jazz/08-11-04

Version 22 (modified by jazz, 16 years ago) (diff)

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2008-11-04

  • Devaraj Das 來訪
    • 09:30 - 10:30 拜會中心主任
    • 11:00 - 12:30 Public Talk Session: "Introduction to Hadoop and Cloud Computing" @ 北群多媒體
    • 14:00 - 17:00 Hands-on Labs (1): "Basics of DFS commands + How to develop MapReduce program using Hadoop?" @ 北群多媒體
  • Hadoop Hands-on Labs (1)
    • download hadoop-0.18.2
      $ cd ~
      $ wget http://ftp.twaren.net/Unix/Web/apache/hadoop/core/hadoop-0.18.2/hadoop-0.18.2.tar.gz
      $ tar zxvf hadoop-0.18.2.tar.gz
      
    • 1. Hadoop 會用 SSH 進行內部連線,因此需要做 SSH Key exchange
      ~$ ssh-keygen
      ~$ cp ~/.ssh/id_rsa.pub ~/.ssh/authorized_keys
      
    • 2. 需要 JAVA_HOME 環境變數才能執行 hadoop namenode
      $ echo "export JAVA_HOME=/usr/lib/jvm/java-6-sun" >> ~/.bash_profile
      $ cd ~/hadoop-0.18.2
      
    • 3. 編輯 conf/hadoop-evn.sh (HADOOP_HOME要設定到你的hadoop安裝目錄)
      export JAVA_HOME=/usr/lib/jvm/java-6-sun
      export HADOOP_HOME=/home/jazz/hadoop-0.18.2/
      export HADOOP_CONF_DIR=$HADOOP_HOME/conf
      
    • 4. 編輯 conf/hadoop-site.xml 在 configuration 那一段加入以下設定
      <property>
        <name>fs.default.name</name>
        <value>hdfs://localhost:9000/</value>
        <description>
          The name of the default file system. Either the literal string
          "local" or a host:port for NDFS.
        </description>
      </property>
      <property>
        <name>mapred.job.tracker</name>
        <value>localhost:9001</value>
        <description>
          The host and port that the MapReduce job tracker runs at. If
          "local", then jobs are run in-process as a single map and
          reduce task.
        </description>
      </property>
      
      
    • 5. 啟動hadoop 的兩道指令
      ~/hadoop-0.18.2$ bin/hadoop namenode -format
      ~/hadoop-0.18.2$ bin/start-all.sh
      
    • 6. 啟動 MapReduce 的指令
      ~/hadoop-0.18.2$ bin/start-mapred.sh
      
  • 也可以放的東西上hdfs去看看
    ~/hadoop-0.18.2$ bin/hadoop dfs -put conf conf
    ~/hadoop-0.18.2$ bin/hadoop dfs -ls
    Found 1 items
    drwxr-xr-x   - jazz supergroup          0 2008-11-04 15:56 /user/jazz/conf