Changes between Version 1 and Version 2 of Hinet130923/Lab5

Timestamp:

Sep 23, 2013, 12:42:44 AM (11 years ago)

Author:

jazz

Comment:

--

Hinet130923/Lab5

@@ -15 +15 @@
 }}}
 
+ * 首先，我們想要瞭解上述練習中一直使用到的指令 hadoop 是什麼。讓我們先用 which 指令，找出它所在的路徑
+{{{
+user@node1:~/hadoop_labs$ which hadoop
+/home/user/hadoop/bin/hadoop 
+}}}
+
+ * 接著，讓我們用指令 file 來查出這個 hadoop 指令是什麼格式。
+{{{
+user@node50:~/hadoop_labs$ file `which hadoop`
+/home/user/hadoop/bin/hadoop: a bash script, ASCII text executable 
+}}}
+
+ * 現在我們知道它是 bash script，那如何針對 bash script 進行除錯呢？我們可以用 bash -x 參數來進行除錯！
+{{{
+user@node50:~/hadoop_labs$ bash -x `which hadoop` fs -ls 
+.... 略 ....
+adoop/libexec/../lib/slf4j-api-1.4.3.jar:/home/user/hadoop/libexec/../lib/slf4j-log4j12-1.4.3.jar:/home/user/hadoop/libex
+ec/../lib/xmlenc-0.52.jar:/home/user/hadoop/libexec/../lib/jsp-2.1/jsp-2.1.jar:/home/user/hadoop/libexec/../lib/jsp-2.1/j
+sp-api-2.1.jar org.apache.hadoop.fs.FsShell -ls
+Found 3 items
+drwxr-xr-x - user supergroup 0 2013-09-23 00:28 /user/user/input
+drwxr-xr-x - user supergroup 0 2013-09-23 00:27 /user/user/tmp
+drwxr-xr-x - user supergroup 0 2013-09-23 00:34 /user/user/toHDFS 
+}}}
+