Changes between Initial Version and Version 1 of III140705/Lab17

Timestamp:

Jul 5, 2014, 8:30:43 AM (11 years ago)

Author:

jazz

Comment:

--

III140705/Lab17

@@ +1 @@
+◢ <[wiki:III140705/Lab16 實作十六]> | <[wiki:III140705 回課程大綱]> ▲ | <[wiki:III140705/Lab18 實作十八]> ◣
+
+= 實作十七 Lab17 =
+
+{{{
+#!html
+<p style="text-align: center;"><big style="font-weight: bold;"><big>將 WordCount 範例改成三個公開的類別<br/>Inner Class v.s. Public Classes </big></big></p>
+}}}
+
+[[PageOutline]]
+
+{{{
+#!text
+請先連線至 nodeN.3du.me , N 為您的報名編號
+}}}
+
+ * 在前兩個範例中，我們可以發現 WordCount 範例程式都是以所謂的 Inner Class 語法撰寫而成，那是否可以改寫成多個 Public Class 呢？答案是可以的！
+{{{
+cd ~/hadoop_labs/lab009
+ant
+hadoop fs -rmr input output
+hadoop fs -put ~/hadoop/conf input
+hadoop jar WordCount.jar input output
+hadoop fs -ls output
+hadoop fs -cat output/part-r-00000
+}}}
+
+== 實作習題 ==
+
+ <問題 1> 請比較 ${HOME}/hadoop_labs/lab007/class 與 ${HOME}/hadoop_labs/lab009/class 的內容，以下哪幾個陳述是正確的？(複選)
+ <提示>
+{{{
+diff ${HOME}/hadoop_labs/lab007/class ${HOME}/hadoop_labs/lab009/class
+}}}
+{{{
+#!text
+      (A) Only in ${HOME}/hadoop_labs/lab009/class/: IntSumReducer.class
+      (B) Only in ${HOME}/hadoop_labs/lab009/class/: TokenizerMapper.class
+      (C) Only in ${HOME}/hadoop_labs/lab007/class/: WordCount$IntSumReducer.class
+      (D) Only in ${HOME}/hadoop_labs/lab007/class/: WordCount$TokenizerMapper.class
+      (D) Only in ${HOME}/hadoop_labs/lab007/class/: WordCount.class
+}}}
+
+ <問題 2> 請問執行任務時，同時有幾個 Mapper？
+{{{
+#!text
+      (A) 0
+      (B) 同 input 目錄檔案區塊個數
+}}}
+
+ <問題 3> 請問執行任務時，同時有幾個 Reducer？
+{{{
+#!text
+      (A) 0
+      (B) 1
+      (C) 2
+      (D) 3
+}}}
+
+ <問題 4> 請問執行任務時，同一個 Map Task 會有幾個 Task Attempt？
+{{{
+#!text
+      (A) 0
+      (B) 1 個(含)以上
+}}}