When comparing Kafka vs ELSA, the Slant community recommends Kafka for most people. In the question“What are the best log management, aggregation & monitoring tools?” Kafka is ranked 8th while ELSA is ranked 47th. The most important reason people chose Kafka is:
Kafka is optimized for supporting a huge number of users.
Specs
Ranked in these QuestionsQuestion Ranking
Pros
Pro Optimized for performance
Kafka is optimized for supporting a huge number of users.
Pro Native mirroring support
Kafka has native support for mirroring.
Pro Native compression support
Kafka has native support for compression.
Pro Open source
ELSA is free and open source, released under the GPL license.
Cons
Con Java is a resource hog
Java is a resource hog, making this far too slow unless you have money to throw at multiple servers with 1/2TB of ram.

Con Need Zookeeper
Kafka can only work with Zookeeper
Con Poor documentation
The project looks already old with a poor documentation and no clear information about the Web UI.
Con Does not work on CentOS
Installation fails on CentOS
