I tried install to add Hive Client and Tze client into an host but failed. When i tried to re-install it, only found the two components have removed from available component list, and it seems there is no option to delete the existing one (unsuccessfully) either. Any suggestions on how to proceed from here to re-install these ? Thanks ... View more

For cluster managed by Ambari, it seems Ambari will also be a single point of failure. Should we consider build HA for Ambari ? If yes, what is the common practice ? It seems there are many discussion on HA for names server, Hive, etc, but seems nothing for Ambari, also wondering why. ... View more

Just wondering whether Abmari does anything additional, when start HDFS/YARN, comparing to from command line directly. I noted below case while testing rack awareness which prompts this questions. Thanks, Allen. I have 4 node cluster installed by Ambari By default, it seems Ambari has already has rack awareness enabled. core-site.xml: <name>net.topology.script.file.name</name>core-site.xml: <value>/etc/hadoop/conf/topology_script.py</value> topology_script.py reads config data from topology_mappings.data topology_script.py:DATA_FILE_NAME = os.path.dirname(os.path.abspath(__file__)) + "/topology_mappings.data" For testing purpose, I modified the rack info in topology_mappings.data a: when restart the HDFS and YARN manually, the change takes effect b. when restart by Ambari, the change is NOT take effect. And further, the topology_mappings.data content is over-written with 'default' value and all my change has gone. (Is Ambari collecting the rack info automatically somewhere ? ) ... View more

The installation has been hanging in last step - show 0% overall for long time. All previous steps were OK. - How to check what is exactly happening ? is there a logfile somewhere on server can check ? - How to do a restart/a fresh start ? i had tried to interrupt the installation (kill -9 back end, even restart the server). But when i restart the server, seems Ambari jump to the last step directly and continue hanging. - FYI, i am trying to setup a 4 nodes cluster under Redhat 7. HDP 2.3 ... View more

I got below error while start Hive CLI under root. FYI, Hive seems work fine under Ambari, in which i can run sql command. Thanks. [root@sandbox aniu]# hive cli WARNING: Use "yarn jar" to launch YARN applications. Logging initialized using configuration in file:/etc/hive/2.4.0.0-169/0/hive-log4j.properties Exception in thread "main" java.lang.RuntimeException: org.apache.tez.dag.api.TezException: org.apache.hadoop.yarn.exceptions.YarnException: Failed to submit application_1475289177250_0006 to YARN : Application application_1475289177250_0006 submitted by user root to unknown queue: default ... View more