@erkansirin78  It seems you have an issue with your known_hosts file, you need to remove the third(3) line in known_hosts file /c/Users/user/.ssh/known_hosts:3  Most likely an SSH altered the encryption keys due to a possible security hole. You can then purge that specific line from your known_hosts file: # sed -i 377d ~/.ssh/known_hosts but it seems your known_hosts file is mounted on the C drive on /c/Users/user/ windows 10!! You can also remove StrictHostKey checking in your ssh configuration file, typically stored at ~/.ssh/config. An example Host block is provided below: Host 101     HostName yourip|hostname     User your_Userid     IdentityFile /path/to/keyfile     Port 22      StrictHostKeyChecking no The specifically added line is the last one StrictHostKeyChecking no which does just that. Please do that and revert     ... View more

@irfangk1  You can definitely use Mysql database alongside postresql any other database for the different HDP components that need back end databases see the screenshots for ranger and ambari DB options but that adds only adds extra administrative complexity to you cluster management like backup and scripts usability     HTH Happy hadooping ... View more