====== hdfs fsck ======

  * [[Hadoop]]
  * [[hdfs]]

** Check the health of a file **

<code>
hdfs fsck /user/root/sample.txt
</code>

<code>
...
The filesystem under path '/user/root/sample.txt' is HEALTHY
</code>

** Check the health of a file, and display the blocks as well **

<code>
hdfs fsck /user/root/sample.txt -files -blocks
</code>

<code>
...
/user/root/sample.txt 2633979 bytes, 1 block(s):  OK
0. BP-1693696885-172.17.0.2-1441734712805:blk_1073742259_1435 len=2633979 repl=3
...
</code>

** Check the health of a file, display the blocks, and which nodes the file is on **

<code>
hdfs fsck /user/root/sample.txt -files -blocks -locations
</code>

<code>
...
0. BP-1693696885-172.17.0.2-1441734712805:blk_1073742259_1435 len=2633979 repl=3 [172.17.0.2:50010, 172.17.0.3:50010, 172.17.0.4:50010]
...
</code>

** Check the health of the entire filesystem **

This must be run as user ''hdfs'' since ''root'' does not have full permissions.

<code>
hdfs fsck /
</code>

<code>
...
The filesystem under path '/' is HEALTHY
</code>