Hadoop 130419075715-phpapp02(1)

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Business Technologie

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)

DataNode

User

128
Mb

DataNode

NameNode
A
64Mb

A
64Mb

B
64Mb

B
64Mb

Check hdfs-site.xml

DataNode

Hadoop

Slaves

Master
NameNode

DataNode

DataNode

DataNode

DataNode

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
NameNode

DataNode

JobTracker

DataNode
TaskTracker

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

Hadoop

Slaves

Master
NameNode

DataNode

JobTracker
SecondaryNode

DataNode
TaskTracker

MapReduce
NameNode
User
Task
A

HDFS

Master
Task

Reduce
Slave1

A1

Final Result
Result1
Result2
Slave2

A2

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