wiki:shunfa/2010/0503

Version 2 (modified by shunfa, 14 years ago) (diff)

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Hadoop 簡化叢集安裝設定

原始安裝設定步驟

執行環境

所有主機環境需已安裝下列套件

  • openssh-server
  • sun-java6-bin
  • sun-java6-jdk
  • sun-java6-jre
    ~$ sudo apt-get install openssh-server
    ~$ sudo apt-get purge java-gcj-compat
    ~$ sudo apt-get install sun-java6-bin  sun-java6-jdk sun-java6-jre
    

設定表(以兩台主機為例)

Steps主機一主機二
角色Data: namenode + datanode
Job: jobtracker + tasktracker
Data: datanode
Job: tasktracker
Step1登入免key密碼登入免key密碼
Step2install Javainstall Java
Step3 下載安裝Hadoop
Step4 設定 hadoop-env.sh
Step5 設定 hadoop-site.xml
Step6 設定masters及slaves
Step7 複製Hadoop_Home內的資料至主機二(or其他slave)
Step8 格式化HDFS
Step9 啟動Hadoop

找不到Datanode時

錯誤訊息

  • /tmp/hadoop/logs/hadoop-shunfa-datanode-shunfa-VBox1.log
    2010-05-03 15:27:26,322 INFO org.apache.hadoop.hdfs.server.datanode.DataNode: STARTUP_MSG:
    /************************************************************
    STARTUP_MSG: Starting DataNode
    STARTUP_MSG:   host = shunfa-VBox1/127.0.1.1
    STARTUP_MSG:   args = []
    STARTUP_MSG:   version = 0.20.2
    STARTUP_MSG:   build = https://svn.apache.org/repos/asf/hadoop/common/branches/branch-0.20 -r 911707; compiled by 'chrisdo' on Fri Feb 19 08:07:34 UTC 2010
    ************************************************************/
    2010-05-03 15:27:30,640 ERROR org.apache.hadoop.hdfs.server.datanode.DataNode: java.io.IOException: Incompatible namespaceIDs in /var/hadoop/hadoop-shunfa/dfs/data: namenode namespaceID = 812261000; datanode namespaceID = 2021031637
            at org.apache.hadoop.hdfs.server.datanode.DataStorage.doTransition(DataStorage.java:233)
            at org.apache.hadoop.hdfs.server.datanode.DataStorage.recoverTransitionRead(DataStorage.java:148)
            at org.apache.hadoop.hdfs.server.datanode.DataNode.startDataNode(DataNode.java:298)
            at org.apache.hadoop.hdfs.server.datanode.DataNode.<init>(DataNode.java:216)
            at org.apache.hadoop.hdfs.server.datanode.DataNode.makeInstance(DataNode.java:1283)
            at org.apache.hadoop.hdfs.server.datanode.DataNode.instantiateDataNode(DataNode.java:1238)
            at org.apache.hadoop.hdfs.server.datanode.DataNode.createDataNode(DataNode.java:1246)
            at org.apache.hadoop.hdfs.server.datanode.DataNode.main(DataNode.java:1368)
    
    2010-05-03 15:27:30,648 INFO org.apache.hadoop.hdfs.server.datanode.DataNode: SHUTDOWN_MSG:
    /************************************************************
    SHUTDOWN_MSG: Shutting down DataNode at shunfa-VBox1/127.0.1.1
    ************************************************************/
    

解法

  • 修改 datanode 的 namespaceID (路徑:/var/hadoop/hadoop-shunfa/dfs/data/current/VESSION)
    namespaceID=2021031637
    改成
    namespaceID=812261000
    
  • 重新啟動Datanode
    hadooper-1:~$ /opt/hadoop/bin/hadoop-daemon.sh start datanode
    hadooper-2:~$ /opt/hadoop/bin/hadoop-daemon.sh start datanode
    

簡化

References