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HadoopEdit by Cassell Hsu
2013.04.19
Hadoop
Master
Slave
Slave
Slave
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
？？
NameNode
•位置資訊 ?•所有資料皆存放在 – DataNode
DataNode•What is DataNode•存放資料
•Where is DataNode•HDFS•Slaves (and Master)
UserUser
DataNodeDataNode
NameNodeNameNode
DataNodeDataNode
DataNodeDataNode
128Mb
B64Mb
A64Mb
Check hdfs-site.xml
B64Mb
A64Mb
Hadoop
DataNodeDataNodeNameNodeNameNode
MasterDataNodeDataNode
DataNodeDataNode
DataNodeDataNode
Slaves
Hadoop•Master•NameNode•JobTracker•SecondaryNameNode
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
DataNodeDataNodeNameNodeNameNode
MasterDataNodeDataNode
Slaves
JobTrackerJobTracker
TaskTrackerTaskTracker
Hadoop•Master•NameNode•JobTracker•SecondaryNameNode
SecondaryNameNode
•What is SecondaryNameNode?•NameNode發生錯誤時補救
•Where is SecondaryNameNode?•Master
Hadoop
DataNodeDataNodeNameNodeNameNode
MasterDataNodeDataNode
Slaves
JobTrackerJobTracker
TaskTrackerTaskTracker
SecondaryNodeSecondaryNode
MapReduce
User Master
Slave2
Slave1
A
A1
A2Task
NameNode
Task
Result1Result2
ReduceFinal
ResultHDFS
MapReduce
•檔案切割•Hadoop上區塊切割•程式指定