Hadoop 130419075715-phpapp02(1)

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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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