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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)

    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。

    1. [hadoop@dev ~]$ hdfs fsck
    2. Usage: DFSck [-list-corruptfileblocks | [-move | -delete | -openforwrite] [-files [-blocks [-locations | -racks]]]]
    3. start checking from this path
    4. -move move corrupted files to /lost+found
    5. -delete delete corrupted files
    6. -files print out files being checked
    7. -openforwrite print out files opened for write
    8. -includeSnapshots include snapshot data if the given path indicates a snapshottable directory or there are snapshottable directories under it
    9. -list-corruptfileblocks print out list of missing blocks and files they belong to
    10. -blocks print out block report
    11. -locations print out locations for every block
    12. -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）

    1. [hadoop@dev ~]$ hdfs fsck /hivedata/warehouse/liuxiaowen.db/lxw_product_names/ -list-corruptfileblocks
    2. 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）

    1. [hadoop@dev ~]$ hdfs fsck /hivedata/warehouse/liuxiaowen.db/lxw_product_names/part-00168 -move
    2. 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
    3. .Status: HEALTHY
    4. Total size: 13497058 B
    5. Total dirs: 0
    6. Total files: 1
    7. Total symlinks: 0
    8. Total blocks (validated): 1 (avg. block size 13497058 B)
    9. Minimally replicated blocks: 1 (100.0 %)
    10. Over-replicated blocks: 0 (0.0 %)
    11. Under-replicated blocks: 0 (0.0 %)
    12. Mis-replicated blocks: 0 (0.0 %)
    13. Default replication factor: 2
    14. Average block replication: 2.0
    15. Corrupt blocks: 0
    16. Missing replicas: 0 (0.0 %)
    17. Number of data-nodes: 15
    18. Number of racks: 1
    19. FSCK ended at Thu Aug 13 09:36:35 CST 2015 in 1 milliseconds
    20.  
    21.  
    22. The filesystem under path '/hivedata/warehouse/liuxiaowen.db/lxw_product_names/part-00168' is HEALTHY

    删除损坏的文件（-delete）

    1. [hadoop@dev ~]$ hdfs fsck /hivedata/warehouse/liuxiaowen.db/lxw_product_names/part-00168 -delete
    2. 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
    3. .Status: HEALTHY
    4. Total size: 13497058 B
    5. Total dirs: 0
    6. Total files: 1
    7. Total symlinks: 0
    8. Total blocks (validated): 1 (avg. block size 13497058 B)
    9. Minimally replicated blocks: 1 (100.0 %)
    10. Over-replicated blocks: 0 (0.0 %)
    11. Under-replicated blocks: 0 (0.0 %)
    12. Mis-replicated blocks: 0 (0.0 %)
    13. Default replication factor: 2
    14. Average block replication: 2.0
    15. Corrupt blocks: 0
    16. Missing replicas: 0 (0.0 %)
    17. Number of data-nodes: 15
    18. Number of racks: 1
    19. FSCK ended at Thu Aug 13 09:37:58 CST 2015 in 1 milliseconds
    20.  
    21.  
    22. 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）

    1. [hadoop@dev ~]$ hdfs fsck /hivedata/warehouse/liuxiaowen.db/lxw_product_names/ -files
    2. 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
    3. /hivedata/warehouse/liuxiaowen.db/lxw_product_names/ dir
    4. /hivedata/warehouse/liuxiaowen.db/lxw_product_names/_SUCCESS 0 bytes, 0 block(s): OK
    5. /hivedata/warehouse/liuxiaowen.db/lxw_product_names/part-00000 13583807 bytes, 1 block(s): OK
    6. /hivedata/warehouse/liuxiaowen.db/lxw_product_names/part-00001 13577427 bytes, 1 block(s): OK
    7. /hivedata/warehouse/liuxiaowen.db/lxw_product_names/part-00002 13588601 bytes, 1 block(s): OK
    8. /hivedata/warehouse/liuxiaowen.db/lxw_product_names/part-00003 13479213 bytes, 1 block(s): OK
    9. /hivedata/warehouse/liuxiaowen.db/lxw_product_names/part-00004 13497012 bytes, 1 block(s): OK
    10. /hivedata/warehouse/liuxiaowen.db/lxw_product_names/part-00005 13557451 bytes, 1 block(s): OK
    11. /hivedata/warehouse/liuxiaowen.db/lxw_product_names/part-00006 13580267 bytes, 1 block(s): OK
    12. /hivedata/warehouse/liuxiaowen.db/lxw_product_names/part-00007 13486035 bytes, 1 block(s): OK
    13. /hivedata/warehouse/liuxiaowen.db/lxw_product_names/part-00008 13481498 bytes, 1 block(s): OK
    14. ...

    检查并打印正在被打开执行写操作的文件（-openforwrite）

    1. [hadoop@dev ~]$ hdfs fsck /hivedata/warehouse/liuxiaowen.db/lxw_product_names/ -openforwrite
    2. 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
    3. ....................................................................................................
    4. ....................................................................................................
    5. .Status: HEALTHY
    6. Total size: 2704782548 B
    7. Total dirs: 1
    8. Total files: 201
    9. Total symlinks: 0
    10. Total blocks (validated): 200 (avg. block size 13523912 B)
    11. Minimally replicated blocks: 200 (100.0 %)
    12. Over-replicated blocks: 0 (0.0 %)
    13. Under-replicated blocks: 0 (0.0 %)
    14. Mis-replicated blocks: 0 (0.0 %)
    15. Default replication factor: 2
    16. Average block replication: 2.0
    17. Corrupt blocks: 0
    18. Missing replicas: 0 (0.0 %)
    19. Number of data-nodes: 15
    20. Number of racks: 1
    21. FSCK ended at Thu Aug 13 09:41:28 CST 2015 in 10 milliseconds
    22.  
    23. 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。

    1. [hadoop@dev ~]$ hdfs fsck /logs/site/2015-08-08/lxw1234.log -files -blocks
    2. 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
    3. /logs/site/2015-08-08/lxw1234.log 7408754725 bytes, 56 block(s): OK
    4. 0. BP-1034052771-172.16.212.130-1405595752491:blk_1075892982_2152381 len=134217728 repl=2
    5. 1. BP-1034052771-172.16.212.130-1405595752491:blk_1075892983_2152382 len=134217728 repl=2
    6. 2. BP-1034052771-172.16.212.130-1405595752491:blk_1075892984_2152383 len=134217728 repl=2
    7. 3. BP-1034052771-172.16.212.130-1405595752491:blk_1075892985_2152384 len=134217728 repl=2
    8. 4. BP-1034052771-172.16.212.130-1405595752491:blk_1075892997_2152396 len=134217728 repl=2
    9. 5. BP-1034052771-172.16.212.130-1405595752491:blk_1075892998_2152397 len=134217728 repl=2
    10. 6. BP-1034052771-172.16.212.130-1405595752491:blk_1075892999_2152398 len=134217728 repl=2
    11. 7. BP-1034052771-172.16.212.130-1405595752491:blk_1075893000_2152399 len=134217728 repl=2
    12. 8. BP-1034052771-172.16.212.130-1405595752491:blk_1075893001_2152400 len=134217728 repl=2
    13. 9. BP-1034052771-172.16.212.130-1405595752491:blk_1075893002_2152401 len=134217728 repl=2
    14. 10. BP-1034052771-172.16.212.130-1405595752491:blk_1075893003_2152402 len=134217728 repl=2
    15. 11. BP-1034052771-172.16.212.130-1405595752491:blk_1075893004_2152403 len=134217728 repl=2
    16. 12. BP-1034052771-172.16.212.130-1405595752491:blk_1075893005_2152404 len=134217728 repl=2
    17. 13. BP-1034052771-172.16.212.130-1405595752491:blk_1075893006_2152405 len=134217728 repl=2
    18. 14. BP-1034052771-172.16.212.130-1405595752491:blk_1075893007_2152406 len=134217728 repl=2
    19. ...

    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。

    1. [hadoop@dev ~]$ hdfs fsck /logs/site/2015-08-08/lxw1234.log -files -blocks -locations
    2. 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
    3. /logs/site/2015-08-08/lxw1234.log 7408754725 bytes, 56 block(s): OK
    4. 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]
    5. 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]
    6. 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]
    7. 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]
    8. 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]
    9. 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]
    10. 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]
    11. 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]
    12. 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]
    13. 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]
    14. ...

    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）

    1. [hadoop@dev ~]$ hdfs fsck /logs/site/2015-08-08/lxw1234.log -files -blocks -locations -racks
    2. 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
    3. /logs/site/2015-08-08/lxw1234.log 7408754725 bytes, 56 block(s): OK
    4. 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]
    5. 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]
    6. 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]
    7. 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]
    8. 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]
    9. 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]
    10. ...

    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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  • 原文地址：https://www.cnblogs.com/felixzh/p/8529922.html
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