@jbowles    Yes, it is advisable to clean up the NM local directories when changing LCE setting, please see https://www.cloudera.com/documentation/enterprise/5-10-x/topics/cdh_sg_other_hadoop_security.html#topic_18_3   Important: Configuration changes to the Linux container executor could result in local NodeManager directories (such as usercache) being left with incorrect permissions. To avoid this, when making changes using either Cloudera Manager or the command line, first manually remove the existing NodeManager local directories from all configured local directories (yarn.nodemanager.local-dirs), and let the NodeManager recreate the directory structure. ... View more