Comparing RocketMQ and Kafka

**Table 1** Functions
Feature	RocketMQ	Kafka
Priority queue	Not supported	Not supported
Delayed queue	Supported	Not supported
Dead letter queue	Supported	Not supported
Message retry	Supported	Not supported
Retrieval mode	Pull-based and push-based	Pull-based
Message broadcasting	Supported	Supported
Message tracking	Supported	Supports offset and timestamp tracking.
Message accumulation	Supported	Supports
Persistence	Supported	Supported
Message tracing	Supported	Not supported
Message filtering	Supported	Supported
Multi-tenancy	Supported	Not supported
Multi-protocol	Compatible with RocketMQ.	Only supports Apache Kafka.
Multi-language	Supports clients in multiple programming languages.	Kafka is written in Scala and Java and supports clients in multiple programming languages.
Throttling	Planned	Supports throttling on producer or consumer clients.
Ordered message delivery	Message order is maintained within a queue.	Supports partition-level FIFO.
Security	Supports SSL authentication.	Supports SSL and SASL authentication and read/write permissions control.
Transactional messages	Supported	Supported