| Version 1 (modified by jazz, 10 years ago) (diff) |
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實作四 Lab 4
HDFS 叢集環境操作練習
HDFS full distributed mode in practice
HDFS full distributed mode in practice
以下練習，請連線至 hadoop.3du.me 操作。底下的 userXX 等於您的用戶名稱。
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/$USER/test.img -files -blocks -locations
FSCK started by user0 from /10.240.1.123 for path /user/$USER/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/$USER/test.img' is HEALTHY
修改副本個數
user0@hdp:~$ hadoop fs -setrep 2 /user/$USER/test.img
Replication 2 set: hdfs://hdp:9000/user/$USER/test.img
user0@hdp:~$ hadoop fsck /user/$USER/test.img -files -blocks -locations
FSCK started by user0 from /10.240.1.123 for path /user/$USER/test.img at Sun
Mar 23 02:45:11 UTC 2014
/user/$USER/test.img 104857600 bytes, 2 block(s): OK
0. blk_-4422576463029178583_1044 len=67108864 repl=2 [10.240.1.123:50010, 10.2
40.174.73:50010]
1. blk_7793285600029540175_1044 len=37748736 repl=2 [10.240.1.123:50010, 10.24
0.116.151:50010]
Status: HEALTHY
Total size: 104857600 B
Total dirs: 0
Total files: 1
Total blocks (validated): 2 (avg. block size 52428800 B)
Minimally replicated blocks: 2 (100.0 %)
Over-replicated blocks: 0 (0.0 %)
Under-replicated blocks: 0 (0.0 %)
Mis-replicated blocks: 0 (0.0 %)
Default replication factor: 1
Average block replication: 2.0
Corrupt blocks: 0
Missing replicas: 0 (0.0 %)
Number of data-nodes: 9
Number of racks: 1
FSCK ended at Sun Mar 23 02:45:11 UTC 2014 in 0 milliseconds
The filesystem under path '/user/$USER/test.img' is HEALTHY
