Change the default value of hbase.rootdir and hbase.tmp.dir?

[ghost]

The Hbase official configuration file recommends to change the default value of hbase.rootdir and hbase.tmp.dir to another location such as 'hbase://...', or else all data will be lost on machine restart.

"Change this setting to point to a location more permanent than '/tmp', the usual resolve for java.io.tmpdir, as the '/tmp' directory is cleared on machine restart."

I wonder if the default setting needs to be changed. Thanks.