# mq

* [OSS](#oss)
* [IBM](#ibm)

## OSS

| by-gemini                | RabbitMQ                                                               | Apache RocketMQ                                                                        | ZeroMQ ($\text{ØMQ}$)                                                                     |
| ------------------------ | ---------------------------------------------------------------------- | -------------------------------------------------------------------------------------- | ----------------------------------------------------------------------------------------- |
| **Architectural Model**  | **Brokered** (Central Server)                                          | **Brokered** (NameServer + Broker Cluster)                                             | **Brokerless** (Networking Library)                                                       |
| **Primary Use Case**     | General purpose messaging, Complex Routing, Task Queues (e.g., Celery) | High-volume, High-reliability, Transactional Messaging, E-commerce, Financial Systems. | High-speed/Low-latency messaging, Building custom, light-weight P2P communication.        |
| **Messaging Paradigm**   | Queue-based (Exchanges route to Queues)                                | Partitioned Queue-based (Topics)                                                       | Socket-based patterns (e.g., PUB/SUB, REQ/REP)                                            |
| **Message Persistence**  | Strong (Configurable to disk for durability)                           | Strong (Financial-grade reliability)                                                   | None by default (Messages are lost if no receiver is connected).                          |
| **Throughput & Latency** | Moderate Throughput, **Very Low Latency**                              | High Throughput, Low Latency (Optimized for scale)                                     | **Extremely High Throughput** and **Lowest Latency** (due to brokerless design)           |
| **Scalability**          | Moderate (Clustering/Mirroring can add complexity/overhead)            | High (Separate NameServer and Broker for easy horizontal scaling)                      | Excellent (Scales N-to-N by adding endpoints, though developer must manage topology)      |
| **Message Routing**      | **Most Flexible** (Uses Exchanges: Direct, Topic, Fanout, etc.)        | Flexible (Topic and Tag-based routing)                                                 | Simple (Pattern-based: must be coded by application developer)                            |
| **Complexity**           | Easier to set up and manage for standard use cases.                    | Moderate to High (More complex architecture with NameServer).                          | High (Requires developers to manage connection logic, fault-tolerance, and message loss). |
| **Implementation**       | Erlang                                                                 | Java                                                                                   | C++ (Language bindings for many languages)                                                |

* <https://github.com/rabbitmq> | when you need a tried-and-true message broker with a focus on **flexible routing**, message reliability, and standard enterprise messaging patterns.
* <https://github.com/apache/rocketmq> | when you need **financial-grade reliability**, high throughput, and features like transactional messages, especially for large-scale distributed systems.
* <https://github.com/zeromq> | when you need the **fastest possible message transfer** between services and are willing to write the application-level logic for reliability, persistence, and complex routing yourself. It is not a broker, but a library.

## IBM

* client libraries: <https://developer.ibm.com/articles/mq-downloads/>
* 9.2.4: <https://hub.docker.com/r/ibmcom/mq/>

<https://github.com/ibm-messaging/mq-container/blob/master/docs/usage.md>

```
docker run \
--env LICENSE=accept \
--env MQ_QMGR_NAME=QM1 \
--publish 1414:1414 \
--publish 9443:9443 \
--detach \
--volume qm1data:/mnt/mqm \
icr.io/ibm-messaging/mq
```