Hi Piyush , You can login to the hawq segment server and can stop the segment with the following ssh hawq-segment su - gpadmin source /usr/local/hawq/greenplum_path.sh hawq stop segment If it still not getting stopped ,look for the orphan segment process in the server and manually kill it (ps -ef|grep postgres ) .It would be good to the check segment logs in the server for the details . Thanks Pratheesh Nair ... View more

Hi Yong , There are certain rpm dependencies in hawq 2.x and the same has to be met as a prerequisite for the installation .Please install required packages in the cluster and move forward with the installation . Following are the list of rpm prerequisite json-c =0.9"}">>=0.9 MIT rhel-6-server-eus-rpms Redhat HDB json support krb5-libs default MIT rhel-6-server-rpms Redhat HDB kerberos libicu default MIT and UCD and Public Domain rhel-6-server-rpms Redhat HDB unicode support openssl 0.9.8 OpenSSL rhel-6-server-rpms Redhat HDB security libgsasl default LGPLv2+ epel Fedora HDB security net-snmp-libs default BSD rhel-6-server-rpms Redhat HDB snmp Please let me know how it goes ! Thanks Pratheesh Nair ... View more

Kerberos and ssl are both protocols, Kerberos is an authentication protocol, but SSL is an encryption protocol.Having said that if you really want to secure your data at motion ,you may need to consider SSL option and for better authentication of clients kerberos would be the best .Also you can have both (ssl & kerberos ) set it up for hawq . ... View more