当Kafka从Python脚本开始时,kafka-server-stop.sh无法正常工作

在远程节点上部署一些Apache Kafka实例后,我观察到了kafka-server-stop.sh作为Kafka存档一部分的脚本问题.

默认情况下,它包含:

#!/bin/sh
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# this work for additional information regarding copyright ownership.
# The ASF licenses this file to You under the Apache License, Version 2.0
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ps ax | grep -i 'kafka\.Kafka' | grep java | grep -v grep | awk '{print $1}' | xargs kill -SIGTERM

如果我执行apache kafka而不是后台进程,这个脚本效果很好,例如:

/var/lib/kafka/bin/kafka-server-start.sh /var/lib/kafka/config/server.properties

当我将它作为后台进程执行时它也可以工作:

/var/lib/kafka/bin/kafka-server-start.sh /var/lib/kafka/config/server.properties &

但是在我的远程节点上,我使用这个python脚本执行它(使用Ansible):

#!/usr/bin/env python
import argparse
import os
import subprocess

KAFKA_PATH = "/var/lib/kafka/"

def execute_command_pipe_output(command_to_call):
  return subprocess.Popen(command_to_call, stdout=subprocess.PIPE, stderr=subprocess.STDOUT)

def execute_command_no_output(command_to_call):
  with open(os.devnull, "w") as null_file:
    return subprocess.Popen(command_to_call, stdout=null_file, stderr=subprocess.STDOUT)  

def start_kafka(args):
  command_to_call = ["nohup"]
  command_to_call += [KAFKA_PATH + "bin/zookeeper-server-start.sh"]
  command_to_call += [KAFKA_PATH + "config/zookeeper.properties"]

  proc = execute_command_no_output(command_to_call)

  command_to_call = ["nohup"]
  command_to_call += [KAFKA_PATH + "bin/kafka-server-start.sh"]
  command_to_call += [KAFKA_PATH + "config/server.properties"]

  proc = execute_command_no_output(command_to_call)

def stop_kafka(args):
  command_to_call = [KAFKA_PATH + "bin/kafka-server-stop.sh"]

  proc = execute_command_pipe_output(command_to_call)
  for line in iter(proc.stdout.readline, b''):
    print line,

  command_to_call = [KAFKA_PATH + "bin/zookeeper-server-stop.sh"]

  proc = execute_command_pipe_output(command_to_call)
  for line in iter(proc.stdout.readline, b''):
    print line,


if __name__ == "__main__":
  parser = argparse.ArgumentParser(description="Starting Zookeeper and Kafka instances")
  parser.add_argument('action', choices=['start', 'stop'], help="action to take")

  args = parser.parse_args()

  if args.action == 'start':
    start_kafka(args)
  elif args.action == 'stop':
    stop_kafka(args)
  else:
    parser.print_help()

执行后

manage-kafka.py start
manage-kafka.py stop

Zookeeper关闭(应该是),但Kafka仍在运行.

什么更有趣,当我调用(手动)

nohup /var/lib/kafka/bin/kafka-server-stop.sh

要么

nohup /var/lib/kafka/bin/kafka-server-stop.sh &

kafka-server-stop.sh正确关闭Kafka实例.我怀疑这个问题可能是由某些Linux/Python引起的.