This is a typical scenario based question and the solution is solely depend upon the errors/warnings appears in the Cloudera Manager.
The warnings could be space issue, service health status, low resources allocations, etc.,
The errors could be log directories are full, services down and other critical events.
In these scenarios, click on the error message and it will take you the respective service/instance status page.
If it’s a space issue, login to the server and go to the respective log directory, clean up some space by zipping/moving or deleting files.
For memory related issues, calculate the total memory available in the node, memory allocated for the services and try to balance the allocation without impacting the service/server.
You may encounter lots of errors/issues when you’re building the cluster on your own and resolving them will give you an idea of the common errors you face in the Cloudera Manager and it’s applicable here.
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