Comparing DMS for RocketMQ and Open-Source RocketMQ

DMS for RocketMQ maintains open-source compatibility while supporting or enhancing features in the open-source versions.

**Table 1** Differences between DMS for RocketMQ and open-source RocketMQ
Feature	DMS for RocketMQ	Open-Source RocketMQ
Delayed/Scheduled messages	Delayed message: There are 18 delay levels. The longest delay is two hours. Scheduled messages: The message delivery delay can be customized. The longest delay is one year.	Only 18 delay levels are supported. The longest delay is two hours.
Ordered messages	Supported	Supported
Message retry	Supported	Supported
Dead letter messages	Supported	Supported
Cluster consumption	Supported	Supported
Message broadcasting	Supported	Supported
Dead letter queues	Supported	Supported
Resetting message retrieval start position	Supported	Supported
Message query	Supported	Supported
Encrypted transmission	Supported	Supported
Message tracing	Supported	Supported
Transactional messages	Supported. The performance is ten times higher than that of open-source RocketMQ when a large number of transactional messages are stacked.	Supported. However, if a large number of transactional messages are stacked, the performance is poor.
Exporting dead letter messages	Supported	Not supported
Data dumping	Planned	Not supported
Instance diagnosis	One-click diagnosis of retrieval issues	Not supported
Instance monitoring	Historical monitoring data can be displayed in graphs. More than 18 metrics can be monitored.	Only current monitoring data can be viewed. Metrics such as CPU and memory cannot be monitored.
ACL	Flexible configuration with a few clicks	Complex configuration
O&M and capacity expansion	Fast expansion with a few clicks	Manual expansion, which is complex