Friday: Global Comprehension for Distributed Replay

Friday is a system for distributed debugging using deterministic replay. Friday allows distributed watchpoints and breakpoints to be placed in the replayed system. Besides these, Friday allows a scripting language (Python) for commands to be associated with the watchpoints and breakpoints. These commands can modify debug variables, implement complex predicates or even call functions of the debugged application. This seems a really important feature to have as exemplified by the simplicity with which the Chord example can be debugged.