Changes between Initial Version and Version 1 of NCTU110329/Lab4

Timestamp:

Apr 12, 2011, 11:41:30 AM (13 years ago)

Author:

jazz

Comment:

--

NCTU110329/Lab4

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+[[PageOutline]]
+
+◢ <[wiki:NCTU110329/Lab3 實作三]> | <[wiki:NCTU110329 回課程大綱]> ▲ | <[wiki:NCTU110329/Lab5 實作五]> ◣
+
+= 實作四 Lab 4 =
+
+{{{
+#!html
+<div style="text-align: center;"><big style="font-weight: bold;"><big>HDFS Shell操作練習<br/>HDFS Shell in practice</big></big></div>
+}}}
+
+== Content 1: HDFS Shell 基本操作 ==
+== Content 1: Basic HDFS Shell Commands ==
+
+=== 1.1 瀏覽你HDFS目錄 ===
+=== 1.1 Browsing Your HDFS Folder ===
+
+{{{
+/opt/hadoop$ bin/hadoop fs -ls
+/opt/hadoop$ bin/hadoop fs -lsr
+}}}
+
+=== 1.2 上傳資料到 HDFS 目錄 ===
+=== 1.2 Upload Files or Folder to HDFS ===
+
+ * 上傳 Upload
+
+{{{
+/opt/hadoop$ bin/hadoop fs -put conf input
+}}} 
+
+ * 檢查 Check
+
+{{{
+/opt/hadoop$ bin/hadoop fs -ls
+/opt/hadoop$ bin/hadoop fs -ls input
+}}}
+ 
+=== 1.3 下載 HDFS 的資料到本地目錄 ===
+=== 1.3 Download HDFS Files or Folder to Local ===
+
+ * 下載 Download
+
+{{{
+/opt/hadoop$ bin/hadoop fs -get input fromHDFS
+}}} 
+
+ * 檢查 Check
+
+{{{
+/opt/hadoop$ ls -al | grep fromHDFS
+/opt/hadoop$ ls -al fromHDFS
+}}}  
+
+=== 1.4 刪除檔案 ===
+=== 1.4 Remove Files or Folder ===
+
+{{{
+/opt/hadoop$ bin/hadoop fs -ls input
+/opt/hadoop$ bin/hadoop fs -rm input/masters
+}}} 
+
+=== 1.5 直接看檔案 ===
+=== 1.5 Browse Files Directly ===
+
+{{{
+/opt/hadoop$ bin/hadoop fs -ls input
+/opt/hadoop$ bin/hadoop fs -cat input/slaves
+}}} 
+
+=== 1.6 更多指令操作 ===
+=== 1.6 More Commands -- Help message ===
+
+{{{
+hadooper@vPro:/opt/hadoop$ bin/hadoop fs 
+
+Usage: java FsShell
+           [-ls <path>]
+           [-lsr <path>]
+           [-du <path>]
+           [-dus <path>]
+           [-count[-q] <path>]
+           [-mv <src> <dst>]
+           [-cp <src> <dst>]
+           [-rm <path>]
+           [-rmr <path>]
+           [-expunge]
+           [-put <localsrc> ... <dst>]
+           [-copyFromLocal <localsrc> ... <dst>]
+           [-moveFromLocal <localsrc> ... <dst>]
+           [-get [-ignoreCrc] [-crc] <src> <localdst>]
+           [-getmerge <src> <localdst> [addnl]]
+           [-cat <src>]
+           [-text <src>]
+           [-copyToLocal [-ignoreCrc] [-crc] <src> <localdst>]
+           [-moveToLocal [-crc] <src> <localdst>]
+           [-mkdir <path>]
+           [-setrep [-R] [-w] <rep> <path/file>]
+           [-touchz <path>]
+           [-test -[ezd] <path>]
+           [-stat [format] <path>]
+           [-tail [-f] <file>]
+           [-chmod [-R] <MODE[,MODE]... | OCTALMODE> PATH...]
+           [-chown [-R] [OWNER][:[GROUP]] PATH...]
+           [-chgrp [-R] GROUP PATH...]
+           [-help [cmd]]
+
+Generic options supported are
+-conf <configuration file>     specify an application configuration file
+-D <property=value>            use value for given property
+-fs <local|namenode:port>      specify a namenode
+-jt <local|jobtracker:port>    specify a job tracker
+-files <comma separated list of files>    specify comma separated files to be copied to the map reduce cluster
+-libjars <comma separated list of jars>    specify comma separated jar files to include in the classpath.
+-archives <comma separated list of archives>    specify comma separated archives to be unarchived on the compute machines.
+The general command line syntax is
+bin/hadoop command [genericOptions] [commandOptions]
+}}}  
+ 
+== Content 2: 使用網頁 GUI 瀏覽資訊 ==
+== Content 2: User Web GUI to browse HDFS ==
+ 
+ * [http://localhost:50030 JobTracker Web Interface]
+ * [http://localhost:50070 NameNode Web Interface]
+ 
+== Content 3: 更多 HDFS Shell 的用法 ==
+== Content 3: More about HDFS Shell ==
+ 
+ * bin/hadoop fs <args> ，下面則列出 <args> 的用法[[BR]]Following are the examples of hadoop fs related commands.
+ * 以下操作預設的目錄在 /user/<$username>/ 下[[BR]]By default, your working directory will be at /user/<$username>/.
+{{{
+$ bin/hadoop fs -ls input
+Found 4 items
+-rw-r--r--   2 hadooper supergroup  115045564 2009-04-02 11:51 /user/hadooper/input/1.txt
+-rw-r--r--   2 hadooper supergroup     987864 2009-04-02 11:51 /user/hadooper/input/2.txt
+-rw-r--r--   2 hadooper supergroup    1573048 2009-04-02 11:51 /user/hadooper/input/3.txt
+-rw-r--r--   2 hadooper supergroup   25844527 2009-04-02 11:51 /user/hadooper/input/4.txt
+}}}
+ * 完整的路徑則是 '''hdfs://node:port/path''' 如：[[BR]]Or you have to give a __''absolute path''__, such as '''hdfs://node:port/path'''
+{{{
+$ bin/hadoop fs -ls hdfs://gm1.nchc.org.tw:9000/user/hadooper/input
+Found 4 items
+-rw-r--r--   2 hadooper supergroup  115045564 2009-04-02 11:51 /user/hadooper/input/1.txt
+-rw-r--r--   2 hadooper supergroup     987864 2009-04-02 11:51 /user/hadooper/input/2.txt
+-rw-r--r--   2 hadooper supergroup    1573048 2009-04-02 11:51 /user/hadooper/input/3.txt
+-rw-r--r--   2 hadooper supergroup   25844527 2009-04-02 11:51 /user/hadooper/input/4.txt
+}}}
+
+=== -cat  === 
+
+ * 將路徑指定文件的內容輸出到 STDOUT [[BR]] Print given file content to STDOUT
+{{{
+$ bin/hadoop fs -cat quota/hadoop-env.sh
+}}} 
+
+===  -chgrp  ===
+
+ * 改變文件所屬的組 [[BR]] Change '''owner group''' of given file or folder
+{{{
+$ bin/hadoop fs -chgrp -R hadooper own
+}}}
+
+=== -chmod === 
+
+ * 改變文件的權限 [[BR]] Change '''read and write permission''' of given file or folder
+{{{
+$ bin/hadoop fs -chmod -R 755 own
+}}}
+
+=== -chown ===
+
+ * 改變文件的擁有者 [[BR]] Change '''owner''' of given file or folder
+{{{
+$ bin/hadoop fs -chown -R hadooper own
+}}}
+
+=== -copyFromLocal, -put ===
+
+ * 從 local 放檔案到 hdfs [[BR]] Both commands will copy given file or folder from local to HDFS
+{{{
+$ bin/hadoop fs -put input dfs_input
+}}}
+
+=== -copyToLocal, -get ===
+
+ * 把hdfs上得檔案下載到 local [[BR]] Both commands will copy given file or folder from HDFS to local
+{{{
+$ bin/hadoop fs -get dfs_input input1
+}}}
+
+=== -cp ===
+
+ * 將文件從 hdfs 原本路徑複製到 hdfs 目標路徑 [[BR]] Copy given file or folder from HDFS source path to HDFS target path
+{{{
+$ bin/hadoop fs -cp own hadooper
+}}}
+
+=== -du ===
+
+ * 顯示目錄中所有文件的大小 [[BR]] Display the size of files in given folder
+{{{
+$ bin/hadoop fs -du input
+
+Found 4 items
+115045564   hdfs://gm1.nchc.org.tw:9000/user/hadooper/input/1.txt
+987864      hdfs://gm1.nchc.org.tw:9000/user/hadooper/input/2.txt
+1573048     hdfs://gm1.nchc.org.tw:9000/user/hadooper/input/3.txt
+25844527    hdfs://gm1.nchc.org.tw:9000/user/hadooper/input/4.txt
+}}}
+=== -dus ===
+
+ * 顯示該目錄/文件的總大小 [[BR]] Display total size of given folder
+{{{
+$ bin/hadoop fs -dus input
+
+hdfs://gm1.nchc.org.tw:9000/user/hadooper/input 143451003
+}}}
+
+=== -expunge ===
+
+ * 清空垃圾桶 [[BR]] Clean up Recycled
+{{{
+$ bin/hadoop fs -expunge
+}}}
+
+=== -getmerge ===
+
+ * 將來源目錄<src>下所有的文件都集合到本地端一個<localdst>檔案內 [[BR]] Merge all files in HDFS source folder <src> into one local file
+{{{
+$ bin/hadoop fs -getmerge <src> <localdst> 
+}}}
+{{{
+$ echo "this is one; " >> in1/input
+$ echo "this is two; " >> in1/input2
+$ bin/hadoop fs -put in1 in1
+$ bin/hadoop fs -getmerge in1 merge.txt
+$ cat ./merge.txt
+}}}
+
+== -ls ===
+
+ * 列出文件或目錄的資訊 [[BR]] List files and folders
+ * 文件名 <副本數> 文件大小 修改日期 修改時間 權限 用戶ID 組ID  [[BR]] <file name> <replication> <size> <modified date> <modified time> <permission> <user id> <group id>
+ * 目錄名 <dir> 修改日期 修改時間 權限 用戶ID 組ID [[BR]] <folder name> <modified date> <modified time> <permission> <user id> <group id>
+{{{
+$ bin/hadoop fs -ls
+}}}
+
+=== -lsr ===
+
+ * ls 命令的遞迴版本 [[BR]] list files and folders with recursive
+{{{
+$ bin/hadoop fs -lsr /
+}}}
+
+=== -mkdir ===
+
+ * 建立資料夾 [[BR]] create directories
+{{{
+$ bin/hadoop fs -mkdir a b c
+}}}
+
+=== -moveFromLocal ===
+
+ * 將 local 端的資料夾剪下移動到 hdfs 上 [[BR]] move local files or folder to HDFS ( it will delete local files or folder. )
+{{{
+$ bin/hadoop fs -moveFromLocal in1 in2
+}}}
+
+=== -mv ===
+
+ * 更改資料的名稱 [[BR]] Change file name or folder name.
+{{{
+$ bin/hadoop fs -mv in2 in3
+}}}
+
+=== -rm ===
+
+ * 刪除指定的檔案（不可資料夾）[[BR]] Remove given files (not folders)
+{{{
+$ bin/hadoop fs -rm in1/input
+}}}
+=== -rmr ===
+
+ * 遞迴刪除資料夾（包含在內的所有檔案） [[BR]] Remove given files and folders with recursive
+{{{
+$ bin/hadoop fs -rmr in1
+}}}
+
+=== -setrep ===
+
+ * 設定副本係數 [[BR]] setup replication numbers of given files or folder
+{{{
+$ bin/hadoop fs -setrep [-R] [-w] <rep> <path/file>
+}}}
+{{{
+$ bin/hadoop fs -setrep -w 2 -R input 
+Replication 2 set: hdfs://gm1.nchc.org.tw:9000/user/hadooper/input/1.txt
+Replication 2 set: hdfs://gm1.nchc.org.tw:9000/user/hadooper/input/2.txt
+Replication 2 set: hdfs://gm1.nchc.org.tw:9000/user/hadooper/input/3.txt
+Replication 2 set: hdfs://gm1.nchc.org.tw:9000/user/hadooper/input/4.txt
+Waiting for hdfs://gm1.nchc.org.tw:9000/user/hadooper/input/1.txt ... done
+Waiting for hdfs://gm1.nchc.org.tw:9000/user/hadooper/input/2.txt ... done
+Waiting for hdfs://gm1.nchc.org.tw:9000/user/hadooper/input/3.txt ... done
+Waiting for hdfs://gm1.nchc.org.tw:9000/user/hadooper/input/4.txt ... done
+}}}
+
+=== -stat ===
+
+ * 印出時間資訊 [[BR]] Print Status of time stamp of folder
+{{{
+$ bin/hadoop fs -stat input
+2009-04-02 03:51:29
+}}}
+=== -tail ===
+
+ * 將文件的最後 1K 內容輸出 [[BR]] Display the last 1K contents of given file
+ * 用法  Usage
+{{{
+bin/hadoop fs -tail [-f] 檔案 (-f 參數用來顯示如果檔案增大，則秀出被append上得內容)
+bin/hadoop fs -tail [-f] <path/file> (-f is used when file had appended)
+}}}
+{{{
+$ bin/hadoop fs -tail input/1.txt
+}}}
+
+=== -test ===
+
+ * 測試檔案， -e 檢查文件是否存在(1=存在, 0＝否)， -z 檢查文件是否為空(1=空, 0＝不為空)， -d 檢查是否為目錄(1=存在, 0＝否) [[BR]] test files or folders [[BR]] -e : check if file or folder existed ( 1 = exist , 0 = false )[[BR]] -z : check if file is empty ( 1 = empty , 0 = false ) [[BR]] -d : check if given path is folder ( 1 = it's folder , 0 = false )
+   * 要用 echo $? 來看回傳值為 0 or 1 [[BR]] You have to use '''echo $?''' to get the return value
+ * 用法 Usage
+{{{
+$ bin/hadoop fs -test -[ezd] URI
+}}}
+ 
+{{{
+$ bin/hadoop fs -test -e /user/hadooper/input/5.txt
+$ bin/hadoop fs -test -z /user/hadooper/input/5.txt
+test: File does not exist: /user/hadooper/input/5.txt
+$ bin/hadoop fs -test -d /user/hadooper/input/5.txt
+
+test: File does not exist: /user/hadooper/input/5.txt
+}}}
+
+=== -text ===
+
+ * 將檔案（如壓縮檔, textrecordinputstream）輸出為純文字格式 [[BR]] Display archive file contents into STDOUT
+{{{
+$ hadoop fs -text <src>
+}}}
+{{{
+$ hadoop fs -text macadr-eth1.txt.gz
+00:1b:fc:61:75:b1
+00:1b:fc:58:9c:23
+}}}
+ * ps : 目前沒支援zip的函式庫 [[BR]] PS. It does not support zip files yet.
+{{{
+$ bin/hadoop fs -text b/a.txt.zip
+PK
+���:��H{
+        a.txtUT b��Ib��IUx��sssss
+test
+PK
+���:��H{
+��a.txtUTb��IUxPK@C
+}}}
+
+=== -touchz ===
+
+ * 建立一個空文件 [[BR]] creat an empty file
+{{{
+$ bin/hadoop fs -touchz b/kk
+$ bin/hadoop fs -test -z b/kk
+$ echo $?
+1
+$ bin/hadoop fs -test -z b/a.txt.zip
+$ echo $?
+0
+}}}