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Nitish Bhardwaj

Business Technology

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
？？

DataNode
• What is DataNode
• 存放資料
• Where is DataNode
• HDFS
• Slaves (and Master)

User
DataNode
NameNode
DataNode
DataNode
12
8M
b
B
64Mb
A
64Mb
Check hdfs-site.xml
B
64Mb
A
64Mb

Hadoop
DataNodeNameNode
Master
DataNode
DataNode
DataNode
Slaves

JobTracker
• What is JobTracker?
• 排程工作
• Where is JobTracker?
• Master
誰來工作？

JobTracker &
TaskTrackerJobTracker TaskTracker
Where Master Slaves
What 排程工作執行工作

Hadoop
DataNodeNameNode
Master
DataNode
Slaves
JobTracker
TaskTracker

SecondaryNameNod
e
• What is SecondaryNameNode?
• NameNode發生錯誤時補救
• Where is SecondaryNameNode?
• Master

Hadoop
DataNodeNameNode
Master
DataNode
Slaves
JobTracker
TaskTracker
SecondaryNode

MapReduce
User Master
Slave2
Slave1
A
A1
A2
Task
NameNode
Task
Result
1
Result
2
Reduc
e
Final
Result
HDFS

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1. Hadoop Edit by Cassell Hsu 2013.04.19

2. Hadoop Master Slave Slave Slave

3. Hadoop • Master • NameNode • JobTracker • SecondaryNameNode

4. 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？？

5. NameNode • 位置資訊? • 所有資料皆存放在 – DataNode

6. DataNode • What is DataNode • 存放資料 • Where is DataNode • HDFS • Slaves (and Master)

7. User DataNode NameNode DataNode DataNode 12 8M b B 64Mb A 64Mb Check hdfs-site.xml B 64Mb A 64Mb

8. Hadoop DataNodeNameNode Master DataNode DataNode DataNode Slaves

9. Hadoop • Master • NameNode • JobTracker • SecondaryNameNode

10. JobTracker • What is JobTracker? • 排程工作 • Where is JobTracker? • Master 誰來工作？

11. JobTracker & TaskTrackerJobTracker TaskTracker Where Master Slaves What 排程工作執行工作

12. Hadoop DataNodeNameNode Master DataNode Slaves JobTracker TaskTracker

13. Hadoop • Master • NameNode • JobTracker • SecondaryNameNode

14. SecondaryNameNod e • What is SecondaryNameNode? • NameNode發生錯誤時補救 • Where is SecondaryNameNode? • Master

15. Hadoop DataNodeNameNode Master DataNode Slaves JobTracker TaskTracker SecondaryNode

16. MapReduce User Master Slave2 Slave1 A A1 A2 Task NameNode Task Result 1 Result 2 Reduc e Final Result HDFS

17. MapReduce • 檔案切割 • Hadoop上區塊切割 • 程式指定

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