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hdfs fsck命令查看HDFS文件对应的文件块信息(Block)和位置信息(Locations)

Hadoop lxw1234@qq.com 14878℃ 2评论

关键字:hdfs fsck、block、locations

在HDFS中,提供了fsck命令,用于检查HDFS上文件和目录的健康状态、获取文件的block信息和位置信息等。

fsck命令必须由HDFS超级用户来执行,普通用户无权限。

[hadoop@dev ~]$ hdfs fsck
Usage: DFSck  [-list-corruptfileblocks | [-move | -delete | -openforwrite] [-files [-blocks [-locations | -racks]]]]
          start checking from this path
        -move   move corrupted files to /lost+found
        -delete delete corrupted files
        -files  print out files being checked
        -openforwrite   print out files opened for write
        -includeSnapshots       include snapshot data if the given path indicates a snapshottable directory or there are snapshottable directories under it
        -list-corruptfileblocks print out list of missing blocks and files they belong to
        -blocks print out block report
        -locations      print out locations for every block
        -racks  print out network topology for data-node locations

下面介绍每一个选项的含义及用法。

查看文件中损坏的块(-list-corruptfileblocks)

[hadoop@dev ~]$ hdfs fsck /hivedata/warehouse/liuxiaowen.db/lxw_product_names/ -list-corruptfileblocks
The filesystem under path '/hivedata/warehouse/liuxiaowen.db/lxw_product_names/' has 0 CORRUPT files

将损坏的文件移动至/lost+found目录(-move)

[hadoop@dev ~]$ hdfs fsck /hivedata/warehouse/liuxiaowen.db/lxw_product_names/part-00168 -move
FSCK started by hadoop (auth:SIMPLE) from /172.16.212.17 for path /hivedata/warehouse/liuxiaowen.db/lxw_product_names/part-00168 at Thu Aug 13 09:36:35 CST 2015
.Status: HEALTHY
 Total size:    13497058 B
 Total dirs:    0
 Total files:   1
 Total symlinks:                0
 Total blocks (validated):      1 (avg. block size 13497058 B)
 Minimally replicated blocks:   1 (100.0 %)
 Over-replicated blocks:        0 (0.0 %)
 Under-replicated blocks:       0 (0.0 %)
 Mis-replicated blocks:         0 (0.0 %)
 Default replication factor:    2
 Average block replication:     2.0
 Corrupt blocks:                0
 Missing replicas:              0 (0.0 %)
 Number of data-nodes:          15
 Number of racks:               1
FSCK ended at Thu Aug 13 09:36:35 CST 2015 in 1 milliseconds


The filesystem under path '/hivedata/warehouse/liuxiaowen.db/lxw_product_names/part-00168' is HEALTHY

删除损坏的文件(-delete)

[hadoop@dev ~]$ hdfs fsck /hivedata/warehouse/liuxiaowen.db/lxw_product_names/part-00168 -delete
FSCK started by hadoop (auth:SIMPLE) from /172.16.212.17 for path /hivedata/warehouse/liuxiaowen.db/lxw_product_names/part-00168 at Thu Aug 13 09:37:58 CST 2015
.Status: HEALTHY
 Total size:    13497058 B
 Total dirs:    0
 Total files:   1
 Total symlinks:                0
 Total blocks (validated):      1 (avg. block size 13497058 B)
 Minimally replicated blocks:   1 (100.0 %)
 Over-replicated blocks:        0 (0.0 %)
 Under-replicated blocks:       0 (0.0 %)
 Mis-replicated blocks:         0 (0.0 %)
 Default replication factor:    2
 Average block replication:     2.0
 Corrupt blocks:                0
 Missing replicas:              0 (0.0 %)
 Number of data-nodes:          15
 Number of racks:               1
FSCK ended at Thu Aug 13 09:37:58 CST 2015 in 1 milliseconds


The filesystem under path '/hivedata/warehouse/liuxiaowen.db/lxw_product_names/part-00168' is HEALTHY

检查并列出所有文件状态(-files)

[hadoop@dev ~]$ hdfs fsck /hivedata/warehouse/liuxiaowen.db/lxw_product_names/ -files
FSCK started by hadoop (auth:SIMPLE) from /172.16.212.17 for path /hivedata/warehouse/liuxiaowen.db/lxw_product_names/ at Thu Aug 13 09:39:38 CST 2015
/hivedata/warehouse/liuxiaowen.db/lxw_product_names/ dir
/hivedata/warehouse/liuxiaowen.db/lxw_product_names/_SUCCESS 0 bytes, 0 block(s):  OK
/hivedata/warehouse/liuxiaowen.db/lxw_product_names/part-00000 13583807 bytes, 1 block(s):  OK
/hivedata/warehouse/liuxiaowen.db/lxw_product_names/part-00001 13577427 bytes, 1 block(s):  OK
/hivedata/warehouse/liuxiaowen.db/lxw_product_names/part-00002 13588601 bytes, 1 block(s):  OK
/hivedata/warehouse/liuxiaowen.db/lxw_product_names/part-00003 13479213 bytes, 1 block(s):  OK
/hivedata/warehouse/liuxiaowen.db/lxw_product_names/part-00004 13497012 bytes, 1 block(s):  OK
/hivedata/warehouse/liuxiaowen.db/lxw_product_names/part-00005 13557451 bytes, 1 block(s):  OK
/hivedata/warehouse/liuxiaowen.db/lxw_product_names/part-00006 13580267 bytes, 1 block(s):  OK
/hivedata/warehouse/liuxiaowen.db/lxw_product_names/part-00007 13486035 bytes, 1 block(s):  OK
/hivedata/warehouse/liuxiaowen.db/lxw_product_names/part-00008 13481498 bytes, 1 block(s):  OK
...

检查并打印正在被打开执行写操作的文件(-openforwrite)

[hadoop@dev ~]$ hdfs fsck /hivedata/warehouse/liuxiaowen.db/lxw_product_names/ -openforwrite
FSCK started by hadoop (auth:SIMPLE) from /172.16.212.17 for path /hivedata/warehouse/liuxiaowen.db/lxw_product_names/ at Thu Aug 13 09:41:28 CST 2015
....................................................................................................
....................................................................................................
.Status: HEALTHY
 Total size:    2704782548 B
 Total dirs:    1
 Total files:   201
 Total symlinks:                0
 Total blocks (validated):      200 (avg. block size 13523912 B)
 Minimally replicated blocks:   200 (100.0 %)
 Over-replicated blocks:        0 (0.0 %)
 Under-replicated blocks:       0 (0.0 %)
 Mis-replicated blocks:         0 (0.0 %)
 Default replication factor:    2
 Average block replication:     2.0
 Corrupt blocks:                0
 Missing replicas:              0 (0.0 %)
 Number of data-nodes:          15
 Number of racks:               1
FSCK ended at Thu Aug 13 09:41:28 CST 2015 in 10 milliseconds

The filesystem under path '/hivedata/warehouse/liuxiaowen.db/lxw_product_names/' is HEALTHY

打印文件的Block报告(-blocks)

需要和-files一起使用。

[hadoop@dev ~]$  hdfs fsck /logs/site/2015-08-08/lxw1234.log -files -blocks
FSCK started by hadoop (auth:SIMPLE) from /172.16.212.17 for path /logs/site/2015-08-08/lxw1234.log at Thu Aug 13 09:45:59 CST 2015
/logs/site/2015-08-08/lxw1234.log 7408754725 bytes, 56 block(s):  OK
0. BP-1034052771-172.16.212.130-1405595752491:blk_1075892982_2152381 len=134217728 repl=2
1. BP-1034052771-172.16.212.130-1405595752491:blk_1075892983_2152382 len=134217728 repl=2
2. BP-1034052771-172.16.212.130-1405595752491:blk_1075892984_2152383 len=134217728 repl=2
3. BP-1034052771-172.16.212.130-1405595752491:blk_1075892985_2152384 len=134217728 repl=2
4. BP-1034052771-172.16.212.130-1405595752491:blk_1075892997_2152396 len=134217728 repl=2
5. BP-1034052771-172.16.212.130-1405595752491:blk_1075892998_2152397 len=134217728 repl=2
6. BP-1034052771-172.16.212.130-1405595752491:blk_1075892999_2152398 len=134217728 repl=2
7. BP-1034052771-172.16.212.130-1405595752491:blk_1075893000_2152399 len=134217728 repl=2
8. BP-1034052771-172.16.212.130-1405595752491:blk_1075893001_2152400 len=134217728 repl=2
9. BP-1034052771-172.16.212.130-1405595752491:blk_1075893002_2152401 len=134217728 repl=2
10. BP-1034052771-172.16.212.130-1405595752491:blk_1075893003_2152402 len=134217728 repl=2
11. BP-1034052771-172.16.212.130-1405595752491:blk_1075893004_2152403 len=134217728 repl=2
12. BP-1034052771-172.16.212.130-1405595752491:blk_1075893005_2152404 len=134217728 repl=2
13. BP-1034052771-172.16.212.130-1405595752491:blk_1075893006_2152405 len=134217728 repl=2
14. BP-1034052771-172.16.212.130-1405595752491:blk_1075893007_2152406 len=134217728 repl=2
...

其中,/logs/site/2015-08-08/lxw1234.log 7408754725 bytes, 56 block(s): 表示文件的总大小和block数;

0. BP-1034052771-172.16.212.130-1405595752491:blk_1075892982_2152381 len=134217728 repl=2
1. BP-1034052771-172.16.212.130-1405595752491:blk_1075892983_2152382 len=134217728 repl=2
2. BP-1034052771-172.16.212.130-1405595752491:blk_1075892984_2152383 len=134217728 repl=2

前面的0. 1. 2.代表该文件的block索引,56的文件块,就从0-55;

BP-1034052771-172.16.212.130-1405595752491:blk_1075892982_2152381表示block id;

len=134217728 表示该文件块大小;

repl=2 表示该文件块副本数;

打印文件块的位置信息(-locations)

需要和-files -blocks一起使用。

[hadoop@dev ~]$  hdfs fsck /logs/site/2015-08-08/lxw1234.log -files -blocks -locations
FSCK started by hadoop (auth:SIMPLE) from /172.16.212.17 for path /logs/site/2015-08-08/lxw1234.log at Thu Aug 13 09:45:59 CST 2015
/logs/site/2015-08-08/lxw1234.log 7408754725 bytes, 56 block(s):  OK
0. BP-1034052771-172.16.212.130-1405595752491:blk_1075892982_2152381 len=134217728 repl=2 [172.16.212.139:50010, 172.16.212.135:50010]
1. BP-1034052771-172.16.212.130-1405595752491:blk_1075892983_2152382 len=134217728 repl=2 [172.16.212.140:50010, 172.16.212.133:50010]
2. BP-1034052771-172.16.212.130-1405595752491:blk_1075892984_2152383 len=134217728 repl=2 [172.16.212.136:50010, 172.16.212.141:50010]
3. BP-1034052771-172.16.212.130-1405595752491:blk_1075892985_2152384 len=134217728 repl=2 [172.16.212.133:50010, 172.16.212.135:50010]
4. BP-1034052771-172.16.212.130-1405595752491:blk_1075892997_2152396 len=134217728 repl=2 [172.16.212.142:50010, 172.16.212.139:50010]
5. BP-1034052771-172.16.212.130-1405595752491:blk_1075892998_2152397 len=134217728 repl=2 [172.16.212.133:50010, 172.16.212.139:50010]
6. BP-1034052771-172.16.212.130-1405595752491:blk_1075892999_2152398 len=134217728 repl=2 [172.16.212.141:50010, 172.16.212.135:50010]
7. BP-1034052771-172.16.212.130-1405595752491:blk_1075893000_2152399 len=134217728 repl=2 [172.16.212.144:50010, 172.16.212.142:50010]
8. BP-1034052771-172.16.212.130-1405595752491:blk_1075893001_2152400 len=134217728 repl=2 [172.16.212.133:50010, 172.16.212.138:50010]
9. BP-1034052771-172.16.212.130-1405595752491:blk_1075893002_2152401 len=134217728 repl=2 [172.16.212.140:50010, 172.16.212.134:50010]
...

和打印出的文件块信息相比,多了一个文件块的位置信息:[172.16.212.139:50010, 172.16.212.135:50010]

打印文件块位置所在的机架信息(-racks)

[hadoop@dev ~]$  hdfs fsck /logs/site/2015-08-08/lxw1234.log -files -blocks -locations -racks
FSCK started by hadoop (auth:SIMPLE) from /172.16.212.17 for path /logs/site/2015-08-08/lxw1234.log at Thu Aug 13 09:45:59 CST 2015
/logs/site/2015-08-08/lxw1234.log 7408754725 bytes, 56 block(s):  OK
0. BP-1034052771-172.16.212.130-1405595752491:blk_1075892982_2152381 len=134217728 repl=2 [/default-rack/172.16.212.139:50010, /default-rack/172.16.212.135:50010]
1. BP-1034052771-172.16.212.130-1405595752491:blk_1075892983_2152382 len=134217728 repl=2 [/default-rack/172.16.212.140:50010, /default-rack/172.16.212.133:50010]
2. BP-1034052771-172.16.212.130-1405595752491:blk_1075892984_2152383 len=134217728 repl=2 [/default-rack/172.16.212.136:50010, /default-rack/172.16.212.141:50010]
3. BP-1034052771-172.16.212.130-1405595752491:blk_1075892985_2152384 len=134217728 repl=2 [/default-rack/172.16.212.133:50010, /default-rack/172.16.212.135:50010]
4. BP-1034052771-172.16.212.130-1405595752491:blk_1075892997_2152396 len=134217728 repl=2 [/default-rack/172.16.212.142:50010, /default-rack/172.16.212.139:50010]
5. BP-1034052771-172.16.212.130-1405595752491:blk_1075892998_2152397 len=134217728 repl=2 [/default-rack/172.16.212.133:50010, /default-rack/172.16.212.139:50010]
...

和前面打印出的信息相比,多了机架信息:[/default-rack/172.16.212.139:50010, /default-rack/172.16.212.135:50010]

 

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  1. 请问楼主用的是哪个版本的 hadoop 啊,是 1.x 还是 2.x 的?
    claxy19942016-03-16 10:54 回复
    • 2.0的
      lxw1234@qq.com2016-03-16 11:12 回复