⚓ [vllm] ensure MASTER_ADDR/MASTER_PORT are set safely#4057
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qgallouedec
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Sep 23, 2025
Co-authored-by: Quentin Gallouédec <gallouedec.quentin@gmail.com>
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What does this pr do?
fixes #3979
This pull request improves the way distributed training environment variables are set for trainers in the
trlpackage. Instead of hardcoding or defaulting to potentially conflicting values forMASTER_ADDRandMASTER_PORT, a new utility function is introduced to safely and automatically select a free port, reducing the risk of collisions during concurrent runs.Distributed training environment setup improvements:
ensure_master_addr_portintrl/trainer/utils.pythat setsMASTER_ADDRand chooses a freeMASTER_PORTif not already set, or if set to "0" or "auto", to avoid port collisions in distributed training.trl/trainer/grpo_trainer.py,trl/trainer/online_dpo_trainer.py, andtrl/trainer/rloo_trainer.pyto includeensure_master_addr_port. [1] [2] [3]MASTER_ADDRandMASTER_PORTin the constructors ofGRPOTrainer,OnlineDPOTrainer, andRLOOTrainerwith calls toensure_master_addr_port, ensuring safer distributed setup. [1] [2] [3]osandsocketintrl/trainer/utils.pyto support the new utility function.