6.824 Distributed Systems Lab 1: MapReduce Completed Passes tests Data race-free Lab 2: Raft 2A: Leader Election Completed Passes tests Data race-free 2B: Log Completed Passes tests Data race-free 2C: Persistence Completed Passes tests Data race-free Lab 3: Fault-tolerant Key/Value Service 3A: Key/Value Service In-progress Cleanup Passes tests Data race-free 3B: Log Compaction In-progress Cleanup Passes tests Data race-free