From Ambari perspective, if you stop HDFS, modify the config property shown below, move all content to the new location it will likely work. Someone from HDFS team can confirm if there is any affinity to the actual folder path. <property> <name>dfs.namenode.checkpoint.dir</name> <value>/hadoop/hdfs/namesecondary</value> </property> ... View more

The location of Slider client is immaterial. Slider client just gets used to submit the Yarn App running HBase. All it needs is access to the HBase App package. ... View more

Not really. We are working on integrating StackAdvisor capability to blueprint based deployment in the next release. That will automatically modify the given blueprint to set correct defaults. Kafka team may have some recommendations. ... View more

Yes you can use APIs. Sample: A PUT call at http://ambari.host:8080/api/v1/clusters/c1/config_groups/2 with payload: [{"ConfigGroup":{"id":2,"cluster_name":"c1","group_name":"A config group","tag":"HDFS","description":"A config group","hosts":[{"host_name":"host1"}],"service_config_version_note":"change","desired_configs":[{"type":"hdfs-site","tag":"version1443587493807","properties":{"dfs.replication":"2","dfs.datanode.du.reserved":"1073741822"}}]}}] will modify the config group. A POST to http://ambari.host:8080/api/v1/clusters/c1/config_groups would have created a new config group. ... View more

High availability for Ambari Server can be achieved by enabling a rapid failover mechanism (an active-passive setup) through an external monitoring tool e.g. Upstart, Supervisor or some other Daemon tool. Customers deploys two (2) Ambari servers configured exactly same having same Ambari property files. One of the server is kept active while the other is stopped. The responsibilities of the external monitoring service are: Ensure there is only one active instance of Ambari Server Monitor the active instance and if it’s down then make a decision to either bring the same instance back up or the replacement instance Ensure that the agents are re-configured to communicate with the active Ambari Server instance Requirements for HA The Ambari DB must be an external DB instance (do not use embedded postgres) Both Ambari Server instances must be configured similarly (options available via ambari-server setup command) Appropriate load-balancer setup to route client requests to the active Ambari Server instance ... View more