@Rahul Khandelwal
You are not able to start HiveServer2 because it should be able to connect with Hive Metastore.
Hence please chekc if the HiveMetastore process started successfully or not and if the port "9083" is opened by Mive Metastore process and is accessible.
# netstat -tnlpa | grep `cat /var/run/hive/hive`
Also please chekc the Hive Metastore log to see if it shows any error.
/var/log/hive/hivemetastore.log
So please check the Hive Metastore log to find out why it is not running successfully. You must see some errors in Hive Metastore logs which will reveal the cause of why the "/hiveserver2" znode is not bound.