What-is-fsck in hadoop ?

fsck stands for File System Check. below is some key of fsck commands:

Fsck is used to resolve error in file.
It is a command used by HDFS file system
By default fsck ignores open files but provides an option to select all files during reporting.
he HDFS fsck command is not a Hadoop shell command.
fsck can be run on the whole file system or on a subset of files.
fsck command to check for various inconsistencies.
fsck is checking the missing blocks for a file or under-replicated blocks.

bin/hdfs fsck

below is parameter in command

Usage: hadoop fsck [GENERIC_OPTIONS] <path> [-move | -delete | -openforwrite] [-files [-blocks [-locations | -racks]]]

<path>	Start checking from this path.
-move	Move corrupted files to /lost+found
-delete	Delete corrupted files.
-openforwrite	Print out files opened for write.
-files	Print out files being checked.
-blocks	Print out block report.
-locations	Print out locations for every block.
-racks	Print out network topology for data-node locations.