The way to check a HDFS directory's size?

Question

I know du -sh in common Linux filesystems. But how to do that with HDFS?

Answer 1

Prior to 0.20.203, and officially deprecated in 2.6.0:

hadoop fs -dus [directory]

Since 0.20.203 (dead link) 1.0.4 and still compatible through 2.6.0:

hdfs dfs -du [-s] [-h] URI [URI …]

You can also run hadoop fs -help for more info and specifics.

Answer 2

When trying to calculate the total of a particular group of files within a directory the -s option does not work (in Hadoop 2.7.1). For example:

Directory structure:

some_dir
├abc.txt    
├count1.txt 
├count2.txt 
└def.txt    

Assume each file is 1 KB in size. You can summarize the entire directory with:

hdfs dfs -du -s some_dir
4096 some_dir

However, if I want the sum of all files containing "count" the command falls short.

hdfs dfs -du -s some_dir/count*
1024 some_dir/count1.txt
1024 some_dir/count2.txt

To get around this I usually pass the output through awk.

hdfs dfs -du some_dir/count* | awk '{ total+=$1 } END { print total }'
2048 

Answer 3

Extending to Matt D and others answers, the command can be till Apache Hadoop 3.0.0

hadoop fs -du [-s] [-h] [-v] [-x] URI [URI ...]

It displays sizes of files and directories contained in the given directory or the length of a file in case its just a file.

Options:

• The -s option will result in an aggregate summary of file lengths being displayed, rather than the individual files. Without the -s option, calculation is done by going 1-level deep from the given path.
• The -h option will format file sizes in a human-readable fashion (e.g 64.0m instead of 67108864)
• The -v option will display the names of columns as a header line.
• The -x option will exclude snapshots from the result calculation. Without the -x option (default), the result is always calculated from all INodes, including all snapshots under the given path.

The du returns three columns with the following format:

 +-------------------------------------------------------------------+ 
 | size  |  disk_space_consumed_with_all_replicas  |  full_path_name | 
 +-------------------------------------------------------------------+ 

Example command:

hadoop fs -du /user/hadoop/dir1 \
    /user/hadoop/file1 \
    hdfs://nn.example.com/user/hadoop/dir1 

Exit Code: Returns 0 on success and -1 on error.

source: Apache doc

Answer 4

With this you will get size in GB

hdfs dfs -du PATHTODIRECTORY | awk '/^[0-9]+/ { print int($1/(1024**3)) " [GB]\t" $2 }'

Answer 5

% of used space on Hadoop cluster
sudo -u hdfs hadoop fs –df

Capacity under specific folder:
sudo -u hdfs hadoop fs -du -h /user

Answer 6

hadoop fs -du -s -h /path/to/dir displays a directory's size in readable form.