RabbitMQ 3.4.2 发布，此版本包括 3.4.1 的 bug 修复，源代码和二进制包都已提供下载。建议所有用户都升级到最新版本。 值得关注的更新如下： ================== server ------ bug fixes 25788 prevent HA queue synchronisation from taking quadratic time when there are many messages on disk (since 3.1.0) 26474 prevent false positive detection of partial partitions (since 3.4.0) 26460 prevent badarg in rabbit_diagnostics:looks_stuck/1 (since 3.3.5) 26417 ensure rabbitmqctl does not get falsely disconnected from the broker when net_ticktime has been reduced (since 1.0.0) 26449 fix garbled inequivalent argument error messages (since 3.4.0) 26468 fix removal of unmirrored queues as part of "rabbitmqctl forget_cluster_node --offline" (since 3.4.0) 26470 improve reliability of promotion of slave mirrors as part of "rabbitmqctl forget_cluster_node --offline" (since 3.4.0) 26367 ensure dead letter exchange arguments are checked for equivalence on queue declaration (since 3.1.4) building and packaging ---------------------- bug fixes 26441 fix rabbitmqctl on the OS X standalone release (since 3.4.0) management plugin ----------------- bug fixes 26472 prevent management agent crashing when log location set to 'tty' (since 3.4.0) 26451 make sure web UI disk chart says "disk free" not "disk used" (since 3.4.0) 26455 fix race condition rendering page (since 2.1.0) 26464 fix drop at the end of data rate charts (since 3.2.0) shovel plugin ------------- bug fixes 26452 make sure auto-delete shovels remove their record from shovel status when deleting (since 3.3.0) 26454 fix autodelete shovel behaviour when started on an empty queue (since 3.3.0) 26453 prevent shovel-management HTTP API returning 500 if queried just as dynamic shovel is being deleted (since 3.3.0) 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 3.4.2 发布，AMQP 消息服务下载地址
