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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
??
SecondaryNameNode
•What is SecondaryNameNode?
•NameNode 發生錯誤時補救
•Where is SecondaryNameNode?
•Master
MapReduce
User Master
Slave2
Slave1
A
A1
A2Task
NameNode
Task
Result1
Result2
Reduce
Final Result
HDFS