Chapter 9. Customizing HDFS
Customize the HDFS Home Directory
By default, the HDFS home directory is set to /user/<user_name>. You can
use the dfs.user.home.base.dir property to customize the HDFS home directory.
In the
hdfs-site.xmlfile, set the following property:<property> <name>dfs.user.home.base.dir</name> <value>/user</value> <description>Base directory of user home.</description> </property>
Where
<value>is the path to the new home directory.
Set the Size of the NameNode Edits Directory
You can use the following hdfs-site.xml properties to control the size of
the directory that holds the NameNode edits directory.
dfs.namenode.num.checkpoints.retained– The number of image checkpoint files that are retained in storage directories. All edit logs necessary to recover an up-to-date namespace from the oldest retained checkpoint are also retained.dfs.namenode.num.extra.edits.retained– The number of extra transactions that should be retained beyond what is minimally necessary for a NameNode restart. This can be useful for audit purposes, or for an HA setup where a remote Standby Node may have been offline for some time and require a longer backlog of retained edits in order to start again.