Hi @Aishwarya Dixit, pe or "Performance Evaluation" is a tool based on MapReduce to test read/writes to HBase. nclients means that 10*nclients mappers will be started to run the supplied pe command. Example: hbase pe randomWrite 2 ... 2017-09-02 01:31:17,681 INFO [main] mapreduce.JobSubmitter: number of splits:20 starts a MR job with 20 mappers and 1 reducer. So you can start with a small number like 1-3 to make sure HBase works as expected, and then increase it to about max number of mappers you can run on your cluster divided by 10. Of course you can use a larger number, but then mappers will run in multiple "waves". ... View more

You use either the public repo pointing to public-repo-1.hortonworks.com/ambari/centos6/2.x/updates/2.5.1.0 (meaning ambari.repo as you download it without any changes), or you download the tar file, untar it, and change ambari.repo so that baseurl points to http://your-apache-server/ambari/centos6 and also change gpgkey to http://your-apache-server/ambari/centos6/RPM-GPG-KEY/RPM-GPG-KEY-Jenkins. Either should work. ... View more

Well, no. The best you can do is to install Kafka on your node (yum install kafka), and copy /etc/kafka/conf files from one of your brokers. Then whenever you change configuration of your Kafka you need to update conf files on your node. If that doesn't happen often you can do it manually, or you can configure rsync to do it for you. ... View more

Either one will work, but on a long-running cluster where you rarely restart Yarn, set it to the FQDN of rm1, and also set rm1 to be the active RM. That's because the discovery of active RM is done in sequence rm1 --> rm2. ... View more

Hi @james.jones The answer is Yes to both your questions. Regarding Spark user and group, in "spark-env" block of "configurations" you can set exactly what you said: "spark_user" : "svcspark", "spark_group" : "svcspark" and yes, Spark will run as svcspark. Regarding Part 2, those settings can be provided in the "cluster-env" block. Property names and defaults are "ignore_groupsusers_create" : "false", "override_uid" : "true", "sysprep_skip_create_users_and_groups" : "false", The best way to familiarize with these and other "obscure" properties is to export a blueprint from an existing cluster, and explore cluster-env and other config blocks. HTH. ... View more