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Introduce Apache Hadoop basic knowledge.

Introduce Apache Hadoop basic knowledge.

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Hadoop Hadoop Presentation Transcript

  • HadoopEdit by Cassell Hsu 2013.04.19
  • Hadoop SlaveMaster Slave Slave
  • Hadoop• Master • NameNode • JobTracker • SecondaryNameNode
  • NameNode• Where is NameNode? • Master • HDFS(Hadoop Distributed File System)• What is NameNode? • 資料之位置資訊 ?? • 資料之屬性
  • NameNode• 位置資訊 ? • 所有資料皆存放在 – DataNode
  • DataNode• What is DataNode • 存放資料• Where is DataNode • HDFS • Slaves (and Master)
  • DataNodeUser NameNode DataNode A A128 64Mb 64MbMb B B 64Mb 64Mb DataNode Check hdfs-site.xml
  • Hadoop Slaves Master DataNodeNameNode DataNode DataNode DataNode
  • Hadoop• Master • NameNode • JobTracker • SecondaryNameNode
  • JobTracker• What is JobTracker? • 排程工作 誰來工作?• Where is JobTracker? • Master
  • JobTracker & TaskTracker JobTracker TaskTracker Where Master Slaves What 排程工作 執行工作
  • Hadoop Slaves Master DataNode TaskTrackerNameNode DataNode JobTracker
  • Hadoop• Master • NameNode • JobTracker • SecondaryNameNode
  • SecondaryNameNode• What is SecondaryNameNode? • NameNode 發生錯誤時補救• Where is SecondaryNameNode? • Master
  • Hadoop Slaves Master DataNode TaskTrackerNameNode DataNode JobTracker SecondaryNode
  • MapReduce NameNode Reduce Slave1 A1 HDFS Final Result Result1User Master Result2 Task Task A Slave2 A2
  • MapReduce• 檔案切割 • Hadoop 上區塊切割 • 程式指定