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Hadoop 130419075715-phpapp02(1)
1.
Hadoop Edit by Cassell
Hsu 2013.04.19
2.
Hadoop Master Slave Slave Slave
3.
Hadoop • Master • NameNode •
JobTracker • SecondaryNameNode
4.
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 ??
5.
NameNode • 位置資訊 ? •
所有資料皆存放在 – DataNode
6.
DataNode • What is
DataNode • 存放資料 • Where is DataNode • HDFS • Slaves (and Master)
7.
UserUser DataNodeDataNode NameNodeNameNode DataNodeDataNode DataNodeDataNode 128 Mb B 64Mb A 64Mb Check hdfs-site.xml B 64Mb A 64Mb
8.
Hadoop DataNodeDataNodeNameNodeNameNode Master DataNodeDataNode DataNodeDataNode DataNodeDataNode Slaves
9.
Hadoop • Master • NameNode •
JobTracker • SecondaryNameNode
10.
JobTracker • What is
JobTracker? • 排程工作 • Where is JobTracker? • Master 誰來工作?
11.
JobTracker & TaskTracker JobTracker
TaskTracker Where Master Slaves What 排程工作 執行工作
12.
Hadoop DataNodeDataNodeNameNodeNameNode Master DataNodeDataNode Slaves JobTrackerJobTracker TaskTrackerTaskTracker
13.
Hadoop • Master • NameNode •
JobTracker • SecondaryNameNode
14.
SecondaryNameNode • What is
SecondaryNameNode? • NameNode 發生錯誤時補救 • Where is SecondaryNameNode? • Master
15.
Hadoop DataNodeDataNodeNameNodeNameNode Master DataNodeDataNode Slaves JobTrackerJobTracker TaskTrackerTaskTracker SecondaryNodeSecondaryNode
16.
MapReduce User Master Slave2 Slave1 A A1 A2 Task NameNode Task Result1 Result2 Reduce Final ResultHDFS
17.
MapReduce • 案切割檔 • Hadoop
上區塊切割 • 程式指定
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