you shoul either use ssh (id_rsa) or install ambari-agent on all hosts after ambari agent is installed (change the  /etc/ambari-agent/conf/ambari-agent.ini ) and set the hostname of ambari-server machine for all machines  then change the /etc/hosts file ( ip_of_machine1 name_of_machine1                                                   ip_of_machine2 name_of_machine2....) then ==> ambari-agent restart for all machines  trusted and tested  ... View more

Thanks Jay. Your solution worked. Thank you, Sachin A ... View more

@Sachin Ambardekar, The doc above may be slightly dated. Rule of thumb, 4GB per core seems to be the sweet spot for memory intensive workloads which are getting more common nowadays. ... View more

@Sachin Ambardekar From HDFS perspective, in some rare circumstances it was noticed that secondary (or standby) namenode fails to consume edit log. This results in more complicated situations if active namenode is restarted meanwhile (unconsumed edit logs will have to be ignored). The simpler solution to handle such scenario more gracefully is to always make sure that fsimage is updated before stopping namenode. So as precautionary measure work was done in Ambari to check and warn user if user tries to stop NameNode that has a checkpoint older than 12 hours. [1] HDFS-3.0.0.0 has implemented this check natively and going forward Ambari might skip this warning. [2] Following Jira's and their description are used as references for this answer: [1] https://issues.apache.org/jira/browse/AMBARI-12951 [2] https://issues.apache.org/jira/browse/HDFS-6353 ... View more

@Jay Kumar SenSharma Any specific reason for lots of symlinks present for binaries in conf and etc dir. It's quite confusing sometime. Do you why it's been designed this way? ... View more

@Sachin Ambardekar Yes you can take explain plan for your hive query by running Syntax : EXPLAIN [EXTENDED|DEPENDENCY|AUTHORIZATION] query You can read more about hive tuning here, https://www.slideshare.net/HadoopSummit/how-to-understand-and-analyze-apache-hive-query-execution-plan-for-performance-debugging ... View more

HOW CAN I GEI THE SMARTSENCE ID? ... View more

@Sachin Ambardekar looks like you have accepted question itself as answer. please select correct answer. ... View more

You've got #1 already answered. For #2, no, you will not be able to search the internet -- you only have access to the project websites mentioned in #1. Good luck! ... View more