We have found the problem. HA for Namenode works fine. But when we are deploying cluster using blueprint only for Resourcemanager HA then Datanodes and Namenode can't to start because of "too small initial heap size" and "too small heap size" exceptions. After some research we figure out that we had missed several configs in our blueprint: yarn.resourcemanager.webapp.address.rm, yarn.resourcemanager.webapp.https.address.rm, fs.defaultFS, hadoop.registry.zk.quorum. Some of these configs are missing in the example for Resourcemanager HA in https://cwiki.apache.org/confluence/display/AMBARI/Blueprint+Support+for+HA+Clusters ... View more