Jobs that were once functional in Datameer now return the following caused by error statement:
Caused by: GSSException: No valid credentials provided (Mechanism level: Failed to find any Kerberos tgt)
It may be possible that while Datameer's configuration has not changed, the cluster could have received an update.
Please ensure that all Datameer configurations match those set on the cluster.
In this particular instance, a Hadoop admin had enabled Kerberos on the cluster side and did not inform the Datameer admin. Datameer was unable to communicate with the cluster until the two configurations were reconciled.