Problem Description
After removing a namespace from the database, clients can still get node not found for partition errors on the removed namespace.
Error -3,1: Node not found for partition namespaceName
Explanation
Currently, namespaces are never deleted from the partition map so when queried, it will act as if the namespace is still part of the cluster. Even if your application checks for the namespace’s existence, it will return that the namespace is present.
There has been a feature request filed to remove a namespace from the partition map if it has been removed from the cluster.
Solution
The error should not be too alarming since it is on a namespace that is no longer part of the database. However, you should get your application to stop querying the namespace to avoid these warnings.