9a6d8e70_Hadoop_Commands_Guide__Description
[COMMAND_OPTION] -setQuota quota dirname...dirname [Description] 
Set the quota quota for each directory dirname. The directory quota is a long integer that puts a hard limit on the number of names in the directory tree. Best effort for the directory, with faults reported if 1. N is not a positive integer, or 2. user is not an administrator, or 3. the directory does not exist or is a file, or 4. the directory would immediately exceed the new quota.
Hadoop Commands Guide