HDP2.5 Hortonworks Sandbox Forgot and Reset root user password

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I was going through a hadoop tutorial and was able to login into maria_dev and root users inside the sandbox. I went ahead and rest the root user password, which was 'hadoop' earlier. Now after a long while I forgot the root use password. Could you please let me know how to reset the password? My environment: Hortonworks HDP 2.5

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There are more than one user. maria_dev is just the database admin account

There should be another account named raj_ops

Otherwise, you'd have to connect into the mysql database for Ambari and start messing with hashed passwords or use the ambari-server CLI