Variables in configuration files may be Java system properties or other
configuration parameters. The list of pre-defined Java system
properties is at:
http://java.sun.com/javase/6/docs/api/java/lang/System.html#getProperties()
Unfortunately the host name is not in that list. You could define it by
adding something like the following to conf/hadoop-env.sh:
HADOOP_DATANODE_OPTS="-Dhost.name=`hostname`"
Doug
sejong king wrote:
Hello,
In hadoop-site.xml, hadoop.tmp.dir uses ${user.name} to retrieve the username
for its directory. Is there a similar way to retrieve the name of the host
that this particular datanode is starting up on? (in order to create unique
directory names for each node. something along the lines of: user.host,
user.local.name, machine.name, etc...)
Thanks!
-Sej
