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RabbitMQ是实现AMQP（高级消息队列协议）的消息中间件的一种，最初起源于金融系统，用于在分布式系统中存储转发消息，在易用性、扩展性、高可用性等方面表现不俗。消息中间件主要用于组件之间的解耦，消息的发送者无需知道消息使用者的存在，反之亦然。 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。 
更新日志Bug 修复 - Queue master process could terminate with a
{bad_match, {error, not_found}} error. - GitHub issue: rabbitmq-server#1035
rabbitmq-service.bat should exit with a non-0 code when installation fails.- GitHub issue: rabbitmq-server#1052
rabbitmqctl stop_app now produces a more technically correct output about- what the operation does.
- GitHub issue: rabbitmq-server#1043
- Nodes in a cluster now can be restared in arbitrary order. They will attempt to contact
- one of the previously seen peers periodically (10 times with 30 second intervals by default).
- GitHub issue: rabbitmq-server#1033
- TLS listeners now support SNI (via Ranch 1.3.0).
- GitHub issue: rabbitmq-server#789
- Worker process shutdown timeout now can be configured.
- GitHub issue: rabbitmq-server#847
- Default Erlang VM ETS limit was increased from 1400 to 50000. This is necessary to support
- a larger number of virtual hosts with the new management plugin.
- GitHub issue: rabbitmq-server#1059
RABBITMQ_PLUGINS_DIR now supports multiple directories (colon-separated on Linux and other UNIX-like- platforms, semicolon-separated on Windows).
- Contributed by Alexey Lebedeff.
- GitHub issue: rabbitmq-server#1001
- Background GC now can be disabled (or use a different target interval value).
- Original patch by Tim Stewart.
- GitHub issue: rabbitmq-server#1026
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