为什么选择RocketMQ
为什么 RocketMQ
在阿里孕育 RocketMQ 的雏形时期，我们将其用于异步通信、搜索、社交网络活动流、数据管道，贸易流程中。随着我们的贸易业务吞吐量的上升，源自我们的消息传递集群的压力也变得紧迫。
根据我们的研究，随着队列和虚拟主题使用的增加，ActiveMQ IO模块达到了一个瓶颈。我们尽力通过节流、断路器或降级来解决这个问题，但效果并不理想。于是我们尝试了流行的消息传递解决方案Kafka。不幸的是，Kafka不能满足我们的要求，其尤其表现在低延迟和高可靠性方面，详见下文。在这种情况下，我们决定发明一个新的消息传递引擎来处理更广泛的消息用例，覆盖从传统的pub/sub场景到高容量的实时零误差的交易系统。
Apache RocketMQ 自诞生以来，因其架构简单、业务功能丰富、具备极强可扩展性等特点被众多企业开发者以及云厂商广泛采用。历经十余年的大规模场景打磨，RocketMQ 已经成为业内共识的金融级可靠业务消息首选方案，被广泛应用于互联网、大数据、移动互联网、物联网等领域的业务场景。
提示
下表显示了RocketMQ、ActiveMQ和Kafka之间的比较
RocketMQ vs. ActiveMQ vs. Kafka
| Messaging Product | Client SDK | Protocol and Specification | Ordered Message | Scheduled Message | Batched Message | BroadCast Message | Message Filter | Server Triggered Redelivery | Message Storage | Message Retroactive | Message Priority | High Availability and Failover | Message Track | Configuration | Management and Operation Tools |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| ActiveMQ | Java, .NET, C++ etc. | Push model, support OpenWire, STOMP, AMQP, MQTT, JMS | Exclusive Consumer or Exclusive Queues can ensure ordering | Supported | Not Supported | Supported | Supported | Not Supported | Supports very fast persistence using JDBC along with a high performance journal，such as levelDB, kahaDB | Supported | Supported | Supported, depending on storage,if using levelDB it requires a ZooKeeper server | Not Supported | The default configuration is low level, user need to optimize the configuration parameters | Supported |
| Kafka | Java, Scala etc. | Pull model, support TCP | Ensure ordering of messages within a partition | Not Supported | Supported, with async producer | Not Supported | Supported, you can use Kafka Streams to filter messages | Not Supported | High performance file storage | Supported offset indicate | Not Supported | Supported, requires a ZooKeeper server | Not Supported | Kafka uses key-value pairs format for configuration. These values can be supplied either from a file or programmatically. | Supported, use terminal command to expose core metrics |
| RocketMQ | Java, C++, Go | Pull model, support TCP, JMS, OpenMessaging | Ensure strict ordering of messages,and can scale out gracefully | Supported | Supported, with sync mode to avoid message loss | Supported | Supported, property filter expressions based on SQL92 | Supported | High performance and low latency file storage | Supported timestamp and offset two indicates | Not Supported | Supported, Master-Slave model, without another kit | Supported | Work out of box,user only need to pay attention to a few configurations | Supported, rich web and terminal command to expose core metrics |