@Deepak SANAGAPALLI The following kind of message indicates some filesystem issue: Unable to access /var/log/ambari-server directory. Confirm the directory is created and is writable by Ambari Server user account 'root' . So please check if you have the mentioned directory created and you are able to create some dummy files inside that dir. # echo "Test" > /var/log/ambari-server/test.log # mkdir -p /var/log/ambari-server/one Check if somehow the "/var/log" filesystem has become read-only by any chance? May be rebooting the host will help in such cases. Also please check if the file "ambari.properties" is showing correct username there: # grep 'ambari-server.user' /etc/ambari-server/conf/ambari.properties ambari-server.user=root . ... View more

@Jes Chergui Hortonworks Sandbox is a learning single host cluster setup for testing and learning purpose. Thats the reason a hostname was chosen that way. Sandbox is a dockerized container. So is there any specific reason you would like to change/customize the Hostname ? You can do that but we wanted to know what is the requirement ? Ambari allows to perform the hostname changes to new hostname as described in the following doc. So when you make the required hostname changes at the docker & "/etc/hosts" file then you might also want to check the following doc: # ambari-server update-host-names host_names_changes.json https://docs.hortonworks.com/HDPDocuments/Ambari-2.6.2.0/bk_ambari-administration/content/ch_changing_host_names.html Followed by the instructions mentioned for formatZK and HDFS. ... View more

@Ruslan Fialkovsky The following HCC article explains some of the points to check for Cluster API slow response scenario. Can you please check if that is helpful for you to troubleshoot the issue? Section: Ambari API Response Time Check https://community.hortonworks.com/articles/131670/ambari-server-performance-tuning-troubleshooting-c.html ... View more

@Manjunath P N You will need to Install the KDC server on the KDC host manually on your own as described in https://docs.hortonworks.com/HDPDocuments/HDP2/HDP-2.6.5/bk_security/content/_optional_install_a_new_mit_kdc.html . What Ambari will do ? >>> Once the KDC server is setup completed as per the above doc and it is running fine then you can simply enable the Kerberos from Ambari UI to your cluster. Ambari will be able to install the Kerberos Client packages on all the cluster host (using yum) and it will also setup the "/etc/krb5.conf" on all cluster machines where the kerberos clients need to be setup and will create the keytabs there. https://docs.hortonworks.com/HDPDocuments/Ambari-2.6.2.2/bk_ambari-security/content/launching_the_kerberos_wizard_automated_setup.html The only thing you will need to manually do it to Install and Setup the KDC server .. so that you can tell ambari where your KDC server is running and what are the Kadmin principals, So that ambari can use that to setup kerberos to your cluster. ... View more

@Michael Bronson I do not think it is possible. This is because you are talking about two different File Systems (HDFS and Local FileSystem). If you want to keep syncing your Local Data Directory to HDFS directory then you can make use of some tools like Apache Flume. ... View more

@Sami Ahmad You are adding "hadoop classpath" however you will also need to add "hbase classpath" something like following: # javap -cp `hadoop classpath`:`hbase classpath`:.:  TestHbaseTable.java . ... View more