Hey guys! Great news! Problem finally solved after 1.5 days of troubleshooting! While digging through the error logs, I saw an error message somewhere in the Cloudera Agent log saying "ValueError: too many values to unpack". Then I search for solutions online to solve that problem. In conclusion, the errors were caused by 1) System time synchronization was disabled. All nodes's system time was not in sync. 2) Latest Java OpenJDK update broke Cloudera Agent. Solution: 1) Enabling system time syncronization(As suggested by @saranvisa) service ntpd start 2) Uninstalling OpenJDK on each node. rpm -qa | grep jdk yum remove <each item from the previous step> 3) Run "Re-run upgrade Wizard" in Cloudera Manager and wait for Inspect Host to finish. Done! Thanks so much for the help guys! Reference: https://community.cloudera.com/t5/Cloudera-Manager-Installation/Problem-with-cloudera-agent/td-p/47698/page/2 https://community.cloudera.com/t5/Cloudera-Manager-Installation/Mismatched-CDH-versions-host-has-NONE-but-role-expect-5/m-p/48780#U48780 ... View more