tcollector daemon hangs and becomes unresponsive.

[xy-man]

https://github.com/OpenTSDB/tcollector/blob/6a4049050201653b10e31ada8d22e7a9a7b94fc8/tcollector.py#L1268

If kill (col.proc) command is failed, tcollector daemon hang with OSError: [Errno 3] No such process. This situation occurs when the process is terminated before os.killpg is called.

I think, kill function maybe needs to be modified like follow:

def kill(proc, signum=signal.SIGTERM):          
  try:                                          
    os.killpg(proc.pid, signum)                 
  except:                                       
    LOG.info('already killed: %s', proc.pid)