It is best to stop all
SAS LASR Analytic Server instances and SAS High-Performance Deployment
of Hadoop. For SAS Visual Analytics deployments, stop the SAS LASR
Analytic Server Monitor, too.
If you prefer to deny
access to the environment while performing this procedure, you can
use the SAS High-Performance Computing Management Console to perform
an SSH lockout. Be sure to permit access for root, the SAS installer
account, the account that is used to run HDFS, and at least one administrator
that can start and stop server instances.
You can ensure that
saving files to HDFS is denied by using safe mode. The following command
is an example:
$HADOOP_HOME/bin/hdfs dfsadmin -safemode enter