I had started with Ambari 2.1.0 and HDP and encountered some issues. After reading forum threads etc., I decided to upgrade to 2.1.2 and carried out the stop, reset and start of the Ambari server. As per the community, I need not bother about the already installed rpm on the nodes.
After I started the fresh installation, during host registration, I got the following warning(do i need to remove any packages ?) : The following packages should be uninstalled *Package* ambari-metrics-monitor.x86_64 2.0.0-151 Installed on 9 hosts hadoop_2_3_2_0_2950-httpfs.x86_64 2.7.1.2.3.2.0-2950.el6 Installed on 1 host ranger_2_3_2_0_2950-yarn-plugin.x86_64 0.5.0.2.3.2.0-2950.el6 Installed on 9 hosts hadoop_2_3_2_0_2950-yarn-proxyserver.x86_64 2.7.1.2.3.2.0-2950.el6 Installed on 1 host hadoop_2_3_2_0_2950-hdfs-fuse.x86_64 2.7.1.2.3.2.0-2950.el6 Installed on 1 host ranger_2_2_4_2_2-hdfs-plugin.x86_64 0.4.0.2.2.4.2-2.el6 Installed on 9 hosts ranger_2_3_2_0_2950-hdfs-plugin.x86_64 0.5.0.2.3.2.0-2950.el6 Installed on 9 hosts hadoop_2_3_2_0_2950-hdfs-journalnode.x86_64 2.7.1.2.3.2.0-2950.el6 Installed on 1 host hadoop_2_3_2_0_2950-yarn.x86_64 2.7.1.2.3.2.0-2950.el6 Installed on 8 hosts hadoop_2_3_2_0_2950-hdfs.x86_64 2.7.1.2.3.2.0-2950.el6 Installed on 9 hosts bigtop-tomcat.noarch 6.0.44-1.el6 Installed on 1 host hadoop_2_3_2_0_2950-libhdfs.x86_64 2.7.1.2.3.2.0-2950.el6 Installed on 8 hosts hadoop_2_3_2_0_2950-hdfs-secondarynamenode.x86_64 2.7.1.2.3.2.0-2950.el6 Installed on 1 host hadoop_2_3_2_0_2950-mapreduce.x86_64 2.7.1.2.3.2.0-2950.el6 Installed on 8 hosts hadoop_2_3_2_0_2950-yarn-nodemanager.x86_64 2.7.1.2.3.2.0-2950.el6 Installed on 1 host hadoop_2_3_2_0_2950-hdfs-datanode.x86_64 2.7.1.2.3.2.0-2950.el6 Installed on 1 host hadoop_2_3_2_0_2950-hdfs-namenode.x86_64 2.7.1.2.3.2.0-2950.el6 Installed on 1 host hadoop_2_3_2_0_2950-source.x86_64 2.7.1.2.3.2.0-2950.el6 Installed on 1 host ranger_2_2_4_2_2-hbase-plugin.x86_64 0.4.0.2.2.4.2-2.el6 Installed on 5 hosts zookeeper_2_3_2_0_2950.noarch 3.4.6.2.3.2.0-2950.el6 Installed on 9 hosts hadoop_2_3_2_0_2950-httpfs-server.x86_64 2.7.1.2.3.2.0-2950.el6 Installed on 1 host hadoop_2_3_2_0_2950-conf-pseudo.x86_64 2.7.1.2.3.2.0-2950.el6 Installed on 1 host hadoop_2_3_2_0_2950-doc.x86_64 2.7.1.2.3.2.0-2950.el6 Installed on 1 host hadoop_2_3_2_0_2950-hdfs-zkfc.x86_64 2.7.1.2.3.2.0-2950.el6 Installed on 1 host ambari-metrics-hadoop-sink.x86_64 2.0.0-151 Installed on 9 hosts hadoop_2_3_2_0_2950.x86_64 2.7.1.2.3.2.0-2950.el6 Installed on 9 hosts hadoop_2_3_2_0_2950-client.x86_64 2.7.1.2.3.2.0-2950.el6 Installed on 7 hosts hadoop_2_3_2_0_2950-yarn-resourcemanager.x86_64 2.7.1.2.3.2.0-2950.el6 Installed on 1 host hdp-select.noarch 2.3.2.0-2950.el6 Installed on 9 hosts hadoop_2_3_2_0_2950-mapreduce-historyserver.x86_64 2.7.1.2.3.2.0-2950.el6 Installed on 1 host hadoop_2_3_2_0_2950-yarn-timelineserver.x86_64 2.7.1.2.3.2.0-2950.el6 Installed on 1 host bigtop-jsvc.x86_64 1.0.10.2.3.2.0-2950.el6 Installed on 9 hosts falcon_2_3_2_0_2950.noarch 0.6.1.2.3.2.0-2950.el6 Installed on 6 hosts accumulo_2_3_2_0_2950-conf-standalone.x86_64 1.7.0.2.3.2.0-2950.el6 Installed on 8 hosts accumulo_2_3_2_0_2950-source.x86_64 1.7.0.2.3.2.0-2950.el6 Installed on 8 hosts accumulo_2_3_2_0_2950.x86_64 1.7.0.2.3.2.0-2950.el6 Installed on 8 hosts accumulo_2_3_2_0_2950-test.x86_64 1.7.0.2.3.2.0-2950.el6 Installed on 8 hosts falcon_2_3_2_0_2950-doc.noarch 0.6.1.2.3.2.0-2950.el6 Installed on 6 hosts ranger_2_2_4_2_2-hive-plugin.x86_64 0.4.0.2.2.4.2-2.el6 Installed on 3 hosts atlas-metadata_2_3_2_0_2950.noarch 0.5.0.2.3.2.0-2950.el6 Installed on 1 host atlas-metadata_2_3_2_0_2950-hive-plugin.noarch 0.5.0.2.3.2.0-2950.el6 Installed on 1 host ambari-metrics-collector.x86_64 2.0.0-151 Installed on 1 host flume_2_3_2_0_2950-agent.noarch 1.5.2.2.3.2.0-2950.el6 Installed on 5 hosts hbase_2_3_2_0_2950-thrift.noarch 1.1.2.2.3.2.0-2950.el6 Installed on 5 hosts hbase_2_3_2_0_2950-master.noarch 1.1.2.2.3.2.0-2950.el6 Installed on 5 hosts flume_2_3_2_0_2950.noarch 1.5.2.2.3.2.0-2950.el6 Installed on 5 hosts hbase_2_3_2_0_2950-regionserver.noarch 1.1.2.2.3.2.0-2950.el6 Installed on 5 hosts hbase_2_3_2_0_2950-rest.noarch 1.1.2.2.3.2.0-2950.el6 Installed on 5 hosts hbase_2_3_2_0_2950.noarch 1.1.2.2.3.2.0-2950.el6 Installed on 5 hosts hbase_2_3_2_0_2950-thrift2.noarch 1.1.2.2.3.2.0-2950.el6 Installed on 5 hosts phoenix_2_3_2_0_2950.noarch 4.4.0.2.3.2.0-2950.el6 Installed on 5 hosts ranger_2_2_4_2_2-storm-plugin.x86_64 0.4.0.2.2.4.2-2.el6 Installed on 5 hosts hbase_2_3_2_0_2950-doc.noarch 1.1.2.2.3.2.0-2950.el6 Installed on 5 hosts ranger_2_3_2_0_2950-hbase-plugin.x86_64 0.5.0.2.3.2.0-2950.el6 Installed on 5 hosts ranger_2_2_4_2_2-knox-plugin.x86_64 0.4.0.2.2.4.2-2.el6 Installed on 1 host
