There may in some scenario when disk attached to data node may go over utilize and you become unable to perform any operation on the data node due to no space left on the system. so we have a option of defining a limit of space which can be used by data node daemons.
Using following configuration:
<property>
<name>dfs.datanode.du.reserved</name>
<value>182400</value>
<description>Reserved space in bytes per volume. This defines to leave this much space free for non dfs use.</description>
</property>
Using following configuration:
<property>
<name>dfs.datanode.du.reserved</name>
<value>182400</value>
<description>Reserved space in bytes per volume. This defines to leave this much space free for non dfs use.</description>
</property>
