Hadoop Comand

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Syntax    :  hadoop fsck /

COMMAND_OPTION

Description

path

Start checking from this path.

-delete

Delete corrupted files.

-files

Print out files being checked.

-files -blocks

Print out the block report

-files -blocks -locations

Print out locations for every block.

-files -blocks -racks

Print out network topology for data-node locations.

-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.

-move

Move corrupted files to /lost+found.

-openforwrite

Print out files opened for write.

 

HDFS supports the fsck command to check for various inconsistencies. It it is designed for reporting problems with various files, for example, missing blocks for a file or under-replicated blocks. Unlike a traditional fsck utility for native file systems, this command does not correct the errors it detects. Normally NameNode automatically corrects most of the recoverable failures. By default fsck ignores open files but provides an option to select all files during reporting


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