Hadoop 130419075715-phpapp02(1)

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Nitish Bhardwaj

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)

UserUser
DataNodeDataNode
NameNodeNameNode
DataNodeDataNode
DataNodeDataNode
128
Mb B
64Mb
A
64Mb
Check hdfs-site.xml
B
64Mb
A
64Mb

Hadoop
DataNodeDataNodeNameNodeNameNode
Master
DataNodeDataNode
DataNodeDataNode
DataNodeDataNode
Slaves

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

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

Hadoop
DataNodeDataNodeNameNodeNameNode
Master
DataNodeDataNode
Slaves
JobTrackerJobTracker
TaskTrackerTaskTracker

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

Hadoop
DataNodeDataNodeNameNodeNameNode
Master
DataNodeDataNode
Slaves
JobTrackerJobTracker
TaskTrackerTaskTracker
SecondaryNodeSecondaryNode

MapReduce
User Master
Slave2
Slave1
A
A1
A2
Task
NameNode
Task
Result1
Result2
Reduce
Final ResultHDFS

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