2nd to last line - com.tableausoftware.controller.dataserver.ExpireSessionsService - Cannot delete locked session
Best guess: It would indicate either a legacy connection (to the data source) is still open, or another user has the data source open, thus creating a 'lock' so when you try and query against the data source, you timeout...
I'm going to move this thread to Server Admin in the hope it gets more specialized attention from the Server experts
(I'm not one of them by the way )
I am also getting the same issue..can you please root-cause or Resolution..?
I am also getting the same error. Well, my dashboards and worksheets are taking huge time to load and while investigating the issue using log files, I see these lines in my dataserver-0.log file. Hopefully someone will have answer soon.