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hadoophdfshortonworks-data-platformnamenode

What is the meaning of DSQUOTA and NSQUOTA columns in Hadoop FsImage?

I have taken a dump of fsimage using OIV tool and NSQUOTA and DSQUOTA fields always have one of the following values

NSQUOTA

  • 1
  • null
  • -1
  • 0

DSQUOTA

  • -1
  • 0

What does NSQUOTA and DSQUOTA represent? How to interpret these values?

Solution

  • NSQUOTA is a name quota (similar to inodes) which limits how many files and directories are allowed under the specified directory.

    DSQUOTA is a directory space quota which limits how many bytes are allowed under that directory.

    Not sure about the other values but the -1 is the default value when you don't use quotas.

    References