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