Re: Namenode Unable to Authenticate to QJM in Secure mode.
In general "GSSException: No valid credentials provided" means you don’t have valid Kerberos credentials. I'm suspecting some issues related to spnego, could you please revisit all of your kerb related configurations, probably you can start from the below configuration. Please share *-site.xml configurations of JN and NNs. Also, please check any unexpected exceptions in KDC server logs.
I've filtered out "REQUEST /getJournal on org.mortbay.jetty.HttpConnection" in your "qjm.log" log file and I could see this has came immediately after your restart, few has succeeded and few others failed with this exception.