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Distributed systems are hard to reason about largely because of uncertaintyabout what may go wrong in a particular execution, and about whether the systemwill mitigate those faults. Tools that perturb executions can help test whethera system is robust to faults, while tools that observe executions can helpbetter understand their system-wide effects. We present Box of Pain, a tracerand fault injector for unmodified distributed systems that addresses bothconcerns by interposing at the system call level and dynamically reconstructingthe partial order of communication events based on causal relationships. Box ofPain's lightweight approach to tracing and focus on simulating the effects ofpartial failures on communication rather than the failures themselves sets itapart from other tracing and fault injection systems. We present evidence ofthe promise of Box of Pain and its approach to lightweight observation andperturbation of distributed systems.

Co-evolving Tracing and Fault Injection with Box of Pain