[[PageOutline]] ◢ <[wiki:III140322/Lab3 實作三]> | <[wiki:III140322 回課程大綱]> ▲ | <[wiki:III140322/Lab5 實作五]> ◣ = 實作四 Lab 4 = {{{ #!html

HDFS 叢集環境操作練習
HDFS full distributed mode in practice

}}} {{{ #!text 以下練習，請連線至 https://lab.3du.me 操作。底下的 hXXXX 等於您的用戶名稱。 }}} == 準備工作 == * 由於 Google Cloud Engine 的 ssh 有些限制，目前先以 https 瀏覽器的連線方式進行實作 * 瀏覽器操作模式比較受限，目前已知 IE 會有問題，Firefox 會打不出 "-" 號，建議採用 Chrome 瀏覽器進行操作。 * 下載 [http://www.google.com.tw/intl/zh-TW/chrome/browser/ Google Chrome] * 連線至 https://lab.3du.me (使用期限: 2014/03/23 00:00 ~ 2014/03/30 23:00) * 備援入口: https://lab2.3du.me , https://lab3.3du.me * 保障您自己使用的權利，請先修改密碼: {{{ user0@hdp:~$ passwd Changing password for user0. (current) UNIX password: Enter new UNIX password: Retype new UNIX password: }}} == 產生目錄 == {{{ user0@hdp:~$ hadoop fs -ls user0@hdp:~$ hadoop fs -mkdir tmp user0@hdp:~$ hadoop fs -ls Found 1 items drwxr-xr-x - user0 supergroup 0 2014-03-23 02:04 /user/user0/tmp }}} == 產生一個 100 MB 的檔案 == {{{ user0@hdp:~$ dd if=/dev/zero of=100mb.img bs=1M count=100 100+0 records in 100+0 records out 104857600 bytes (105 MB) copied, 0.0589096 s, 1.8 GB/s user0@hdp:~$ hadoop fs -put 100mb.img test.img user0@hdp:~$ hadoop fs -ls Found 2 items -rw-r--r-- 1 user0 supergroup 104857600 2014-03-23 02:08 /user/user0/test.img drwxr-xr-x - user0 supergroup 0 2014-03-23 02:04 /user/user0/tmp }}} == 觀察 block 分佈情形 == {{{ user0@hdp:~$ hadoop fsck /user/user0/test.img -files -blocks -locations FSCK started by user0 from /10.240.1.123 for path /user/user0/test.img at Sun Mar 23 02:11:08 UTC 2014 /user/user0/test.img 104857600 bytes, 2 block(s): OK 0. blk_-4422576463029178583_1044 len=67108864 repl=1 [10.240.1.123:50010] 1. blk_7793285600029540175_1044 len=37748736 repl=1 [10.240.1.123:50010] Status: HEALTHY Total size: 104857600 B Total dirs: 0 Total files: 1 Total blocks (validated): 2 (avg. block size 52428800 B) Minimally replicated blocks: 2 (100.0 %) Over-replicated blocks: 0 (0.0 %) Under-replicated blocks: 0 (0.0 %) Mis-replicated blocks: 0 (0.0 %) Default replication factor: 1 Average block replication: 1.0 Corrupt blocks: 0 Missing replicas: 0 (0.0 %) Number of data-nodes: 9 Number of racks: 1 FSCK ended at Sun Mar 23 02:11:08 UTC 2014 in 9 milliseconds The filesystem under path '/user/user0/test.img' is HEALTHY }}} == 修改副本個數 == {{{ user0@hdp:~$ hadoop fs -setrep 2 /user/user0/test.img Replication 2 set: hdfs://hdp:9000/user/user0/test.img user0@hdp:~$ hadoop fsck /user/user0/test.img -files -blocks -locations FSCK started by user0 from /10.240.1.123 for path /user/user0/test.img at Sun Mar 23 02:45:11 UTC 2014 /user/user0/test.img 104857600 bytes, 2 block(s): OK 0. blk_-4422576463029178583_1044 len=67108864 repl=2 [10.240.1.123:50010, 10.2 40.174.73:50010] 1. blk_7793285600029540175_1044 len=37748736 repl=2 [10.240.1.123:50010, 10.24 0.116.151:50010] Status: HEALTHY Total size: 104857600 B Total dirs: 0 Total files: 1 Total blocks (validated): 2 (avg. block size 52428800 B) Minimally replicated blocks: 2 (100.0 %) Over-replicated blocks: 0 (0.0 %) Under-replicated blocks: 0 (0.0 %) Mis-replicated blocks: 0 (0.0 %) Default replication factor: 1 Average block replication: 2.0 Corrupt blocks: 0 Missing replicas: 0 (0.0 %) Number of data-nodes: 9 Number of racks: 1 FSCK ended at Sun Mar 23 02:45:11 UTC 2014 in 0 milliseconds The filesystem under path '/user/user0/test.img' is HEALTHY }}}