RabbitMQ 3.5.7 发布，AMQP 消息服务器

刘伟

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RabbitMQ 3.5.7 是一个可用的 bug 修复版本，主要更新如下：服务器
Bug 修复
　　

• 　　Fix a race condition that could prevent nodes from stopping.
  　　GitHub issue: rabbitmq-server#465
  
• 　　file_handle_cache:clear_read_cache/0 no longer silently fails.
  　　The function is mean to be used with rabbitmqctl eval in environments where
  　　in-process buffering of file data is enabled.
  　　GitHub issue: rabbitmq-server#436
  
• 
  　　Default RABBITMQ_PLUGINS_DIR value on Windows should be calculated as>　　server installation directory, not RABBITMQ_BASE.
  　　If you override RABBITMQ_BASE, you may need to copy plugins from %RABBITMQ_BASE%\plugins
  　　to the plugins directory under RabbitMQ installation.
  　　GitHub issue: rabbitmq-server#433
  
• 　　When rabbitmq-server failed to start due to an unreadable config file, exit code was 0
  　　GitHub issue: rabbitmq-server#464
  
• 　　Overriding RABBITMQ_LOGS and RABBITMQ_SASL_LOGS on Windows prevented node from starting.
  　　GitHub issue: rabbitmq-server#375
  
• 　　Some startup code bits assumed IPv4 is enabled in the environment
  　　GitHub issue: rabbitmq-server#117
  
• 　　More robust disk monitor, fewer errors logged.
  　　GitHub issue: rabbitmq-server#91
  
• 　　rabbitmqctl forget_cluster_node no longer attempts to impersonate live
  　　(reachable) nodes.
  　　GitHub issue: rabbitmq-server#470
  
• 　　rabbitmq-plugins was using an incorrect env variable.
  　　GitHub issue: rabbitmq-server#451
  

提升

• 　　RAM watermark can be configured as an absolute value in bytes (just like with disk space monitoring):
  [{rabbit, [{vm_memory_high_watermark, {absolute, 1073741824}}]}].　　GitHub issue: rabbitmq-server#207
  
• 　　rabbitmqctl authenticate_user is a new command that can be used to test user authentication.
  　　GitHub issue: rabbitmq-server#119
  
• 　　rabbitmqctl now supports exclusive as a queue info item.
  　　Contributed by Alexey Lebedeff (@binarin).
  　　GitHub issue: rabbitmq-server#371
  

　　下载页面：rabbitmq_v3_5_7
　　
　　RabbitMQ 是由 LShift 提供的一个 Advanced Message Queuing Protocol (AMQP) 的开源实现，由以高性能、健壮以及可伸缩性出名的 Erlang 写成，因此也是继承了这些优点。
　　AMQP 里主要要说两个组件：Exchange 和 Queue （在 AMQP 1.0 里还会有变动），如下图所示，绿色的 X 就是
Exchange ，红色的是 Queue ，这两者都在 Server 端，又称作 Broker ，这部分是 RabbitMQ
实现的，而蓝色的则是客户端，通常有 Producer 和 Consumer 两种类型：