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HyCoR is a fully-operational fault tolerance mechanism for multiprocessorworkloads, based on container replication, using a hybrid of checkpointing andreplay. HyCoR derives from two insights regarding replication mechanisms: 1)deterministic replay can overcome a key disadvantage of checkpointing alone --unacceptably long delays of outputs to clients, and 2) checkpointing canovercome a key disadvantage of active replication with deterministic replayalone -- vulnerability to even rare replay failures due to an untrackednondeterministic events. With HyCoR, the primary sends periodic checkpoints tothe backup and logs the outcomes of sources of nondeterminism. Outputs toclients are delayed only by the short time it takes to send the correspondinglog to the backup. Upon primary failure, the backup replays only the shortinterval since the last checkpoint, thus minimizing the window ofvulnerability. HyCoR includes a "best effort" mechanism that results in a highrecovery rate even in the presence of data races, as long as their rate is low.The evaluation includes measurement of the recovery rate and recovery latencybased on fault injection. On average, HyCoR delays responses to clients by lessthan 1ms and recovers in less than 1s. For a set of eight real-worldbenchmarks, if data races are eliminated, the performance overhead of HyCoR isunder 59%.

HyCoR: Fault-Tolerant Replicated Containers Based on Checkpoint and Replay