Diagnostic Tests

Thread dumps

The thread dumps on the front-end application servers revealed a similar pattern across all the DRPs. A few threads were busy making a call to the back-end, and most of the others were waiting for an available connection to call the back-end. The waiting threads were all blocked on a resource pool, one that had no timeout. If the back-end stopped responding, then the threads making the calls would never return, and the ones that were blocked would never have their chance to make their calls. In short, every single request-handling thread, all ...