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The document discusses the key components of Hadoop including the NameNode, DataNodes, JobTracker, TaskTracker, and SecondaryNameNode. The NameNode stores metadata about data locations and attributes and is located on the master node. DataNodes store the actual data blocks across slave nodes. The JobTracker schedules jobs and is also located on the master node, while TaskTrackers execute tasks on slave nodes. The SecondaryNameNode assists if the NameNode fails. Hadoop uses a master/slave architecture with the NameNode and JobTracker on the master and DataNodes and TaskTrackers on slave nodes. MapReduce is used for distributed processing where data is split into blocks and mapped and reduced across nodes.
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- 1. Hadoop Edit by CassellHsu 2013.04.19
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- 3. Hadoop • Master • NameNode •JobTracker • SecondaryNameNode
- 4. NameNode • Where isNameNode? • Master • HDFS(Hadoop Distributed File System) • What is NameNode? • 資料之位置資訊 • 資料之屬性 ？？
- 5. NameNode • 位置資訊? • 所有資料皆存放在– DataNode
- 6. DataNode • What isDataNode • 存放資料 • Where is DataNode • HDFS • Slaves (and Master)
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- 9. Hadoop • Master • NameNode •JobTracker • SecondaryNameNode
- 10. JobTracker • What isJobTracker? • 排程工作 • Where is JobTracker? • Master 誰來工作？
- 11. JobTracker & TaskTrackerJobTracker TaskTracker WhereMaster Slaves What 排程工作 執行工作
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- 13. Hadoop • Master • NameNode •JobTracker • SecondaryNameNode
- 14. SecondaryNameNod e • What isSecondaryNameNode? • NameNode發生錯誤時補救 • Where is SecondaryNameNode? • Master
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