Parameter Server receive the interrupt signal and shutdown gracefully

[velconia]

PServer will start like this

PADDLE_INIT_PORT=6174 PADDLE_INIT_PSERVERS=192.168.1.2 TRAINERS=2 POD_IP=192.168.1.2 PADDLE_INIT_TRAINER_ID=1 TRAINING_ROLE=PSERVER python your_distributed_program.py

However, after this pserver process is started, only SIGKILL(kill -9) or SIGQUIT(ctrl + ) could stop the process, the interruption from keyboard and SIGTERM(kill or kill -TERM) could NOT stop the process

I will add the interrupt signal handler in the ListenAndServOp, and exit the program when these signals listed below is sent to then program:
SIGTERM, SIGINT