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Hadoop 
Edit 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)
UUsseerr 
DDaattaaNNooddee 
NNaammeeNNooddee 
DDaattaaNNooddee 
DDaattaaNNooddee 
A 
64Mb 
128 
Mb B 
64Mb 
A 
64Mb 
B 
64Mb 
Check hdfs-site.xml
Hadoop 
Master 
NNaammeeNNooddee DDaattaaNNooddee 
Slaves 
DDaattaaNNooddee 
DDaattaaNNooddee 
DDaattaaNNooddee
Hadoop 
• Master 
• NameNode 
• JobTracker 
• SecondaryNameNode
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 
Master 
NNaammeeNNooddee DDaattaaNNooddee 
Slaves 
DDaattaaNNooddee 
JJoobbTTrraacckkeerr 
TTaasskkTTrraacckkeerr
Hadoop 
• Master 
• NameNode 
• JobTracker 
• SecondaryNameNode
SecondaryNameNode 
• What is SecondaryNameNode? 
• NameNode發生錯誤時補救 
• Where is SecondaryNameNode? 
• Master
Hadoop 
Master 
NNaammeeNNooddee DDaattaaNNooddee 
Slaves 
DDaattaaNNooddee 
JJoobbTTrraacckkeerr 
TTaasskkTTrraacckkeerr 
SSeeccoonnddaarryyNNooddee
MapReduce 
HDFS Final Result 
User Master 
Reduce 
Slave1 
Slave2 
A 
A1 
A2 
Task 
NameNode 
Task 
Result1 
Result2
MapReduce 
• 檔案切割 
• Hadoop上區塊切割 
• 程式指定

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