System hangs or freezes due to hung threads
One of the production systems went into a hung state. Many hung thread warning messages are observable in the WebSphere SystemOut logfile.
11/19/16 0:02:40:835 EST] 000000aa ThreadMonitor W WSVR0605W: Thread "WorkManager.PegaWorkManager : 16" (0000058b) has been active for 609045 milliseconds and may be hung. There is/are 1 thread(s) in total in the server that may be hung.
Steps to Reproduce
A defect or configuration issue in the operating environment.
A database job was causing significant latency on the database server. This had the effect of making the interactions between the Pega and the database slow to the point of unusability.
Make the following change to the operating environment: The database job was canceled, thus eliminating the issue.