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RabbitMQ 3.5.1 发布，AMQP 消息服务器

4月18日武汉源创会开始报名，送华为开发板

RabbitMQ 3.5.1 发布，此版本是个 bug 修复版本，主要改进如下：

服务器

功能增强

Introduce a new channel log category for channel log messages ( rabbitmq/rabbitmq-server#74 ).

Bug 修复

Ensure consumer_closed events are emitted for the actually closed channels only, not all of them (since 3.3.0, rabbitmq/rabbitmq-server#86 ). The events were filtered later in the management plugin so the behaviour was correct. However, the broker did way too much work.
Ensure the number of x-death message headers doesn't grow indefinitely ( rabbitmq/rabbitmq-server#78 ). Now, there is a single entry for each {queue, reason} pair.
Adjust the file read buffer cache size to avoid useless reads (since 3.5.0, rabbitmq/rabbitmq-server#69 ). Before this fix, reading a file backward would cause the buffer to be filled and thrown away quickly, leading to a large I/O bandwidth consumption.
Ensure the priority queue plugin reports its memory consumption properly (since 3.5.0, rabbitmq/rabbitmq-server#67 ). Before this fix, the queue might not be paged out under memory pressure.
Prevent a crash while synchronising paged out priority queues (since 3.5.0, rabbitmq/rabbitmq-server#65 ). This was caused by priority queues accessing message properties without checking their existence.
Pass the PID file to rabbitmqctl stop in rabbitmq-server.ocf , exactly like Debian- and Red Hat-flavour init scripts (since 2.6.0, rabbitmq/rabbitmq-server#72 ).

更多改进请看这里： https://github.com/rabbitmq/rabbitmq-server/releases/tag/rabbitmq_v3_5_1 。

此版本现已提供下载：

rabbitmq-server-3.5.1.exe
rabbitmq-server-windows-3.5.1.zip
rabbitmq-server-mac-standalone-3.5.1.tar.gz
rabbitmq-server-generic-unix-3.5.1.tar.gz
Source code (zip)

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：

RabbitMQ 3.5.1 发布，AMQP 消息服务器