I am preparing to add at-rest encryption to all of the nodes in out mapr cluster. However, I am concerned about what will happen to the data stored in the maprfs if if all of the nodes where to be shut down in order to do this. Is the data in the maprfs persistent anywhere when a cluster is brought down and will it know how to recover when the nodes are brought back up? I know in apache hadoop there is namenode and datanode data stored locally on nodes based on hadoop config files, is there a similar process for the mapr system?
The mapr cluster we have running on the nodes was installed using the wizard installer for mapr 6.0. Would this be the easiest way to shut down the cluster and bring it back up again (using the web ui)?
Any further explanation of this aspect of how mapr works and suggestions as to the safest way to to the at-rest encryption would be appreciated. Thanks.