@frank chen From your logs we see that agents are failing to communicate with ambari-server. INFO 2017-05-05 14:05:11,156 NetUtil.py:67 - Connecting to https://centos7-node1:8440/ca WARNING 2017-05-05 14:05:11,157 NetUtil.py:98 - Failed to connect to https://centos7-node1:8440/ca due to [Errno 111] \xe6\x8b\x92\xe7\xbb\x9d\xe8\xbf\x9e\xe6\x8e\xa5 WARNING 2017-05-05 14:05:11,157 NetUtil.py:121 - Server at https://centos7-node1:8440 is not reachable, sleeping for 10 seconds... Please make sure that the agents are able to access the ambari-server hostname & port properly. There should be no iptables/firewall restriction. Please check that you are able to do telnet from agent machine to connect to ambari server? 8440: Handshake Port for Ambari Agents to Ambari Server 8441: Registration and Heartbeat Port for Ambari Agents to Ambari Server # telnet centos7-node1 8440 # telnet centos7-node1 8441 # telnet centos7-node1 8080 Also on ambari server and agent hosts please make sure that the hostnames are resolvable throughout the cluster (means every host has the correct "/etc/hosts" entry to resolve other hosts. The output of the following command shoudl be resolvable and consistent through out the cluster hosts. # hostname -f https://docs.hortonworks.com/HDPDocuments/Ambari-2.4.2.0/bk_ambari-installation/content/set_the_hostname.html . ... View more

@Ward Bekker In the Ambari UI --> HDFS --> Configs --> Advanced --> "hadoop-env template" you will see the "SHARED_HADOOP_NAMENODE_OPTS" variable that is setting the -Dhdfs.audit.logger=INFO,DRFAAUDIT Above actually controls the audit logging. So you might want to delete that "hdfs.audit.logger" system property from the if-else block (same for HADOOP_DATANODE_OPTS option as well) {% if java_version < 8 %} SHARED_HADOOP_NAMENODE_OPTS= ........ {% else %} SHARED_HADOOP_NAMENODE_OPTS= {% endif %} . After that when we restart the HDFS components then in the "ps -ef | grep NameNode" we should not see the "-Dhdfs.audit.logger=INFO,DRFAAUDIT" . ... View more

@ARUN The following HDP2.6 document talks about incremental backups of HBase. https://docs.hortonworks.com/HDPDocuments/HDP2/HDP-2.6.0/bk_data-access/content/ch_hbase_bar.html ... View more

@Michael Londeen Are you using ActiveDirectory or LDAP in your setup? Can you please try setting the "ignore_groupsusers_create" parameter value to "true" and then ry restarting the services again? Example: # /var/lib/ambari-server/resources/scripts/configs.sh set <AMBARI_FQDN> <CLUSTER_NAME> cluster-env "ignore_groupsusers_create" "true" It will made it skip users and groups creating part. Basically enabling this flag, user have to create users/groups on his own, So Ambari will not attempt to create the hadoop group for you and expected the group exists. . ... View more