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nitish-bhardwaj
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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
??
UserUser
DataNodeDataNode
NameNodeNameNode
DataNodeDataNode
DataNodeDataNode
128Mb
B64Mb
A64Mb
Check hdfs-site.xml
B64Mb
A64Mb
Hadoop
DataNodeDataNodeNameNodeNameNode
MasterDataNodeDataNode
DataNodeDataNode
DataNodeDataNode
Slaves
Hadoop
DataNodeDataNodeNameNodeNameNode
MasterDataNodeDataNode
Slaves
JobTrackerJobTracker
TaskTrackerTaskTracker
Hadoop
DataNodeDataNodeNameNodeNameNode
MasterDataNodeDataNode
Slaves
JobTrackerJobTracker
TaskTrackerTaskTracker
SecondaryNodeSecondaryNode
MapReduce
User Master
Slave2
Slave1
A
A1
A2Task
NameNode
Task
Result1
Result2
Reduce
Final Result
HDFS