Redis vs hanna: What are the differences?

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1. Data Structure Support: Redis only supports simple data structures like strings, lists, sets, and hashes, while Hanna provides support for more complex data structures such as trees, graphs, and hypergraphs.
2. Persistence: Redis does not offer full ACID compliance and persistence is achieved through asynchronous replication and periodic snapshots, whereas Hanna ensures full ACID compliance and persistence through immediate disk writes for each operation.
3. Scalability: Redis is typically used as a single-node database but can be scaled horizontally using Redis Cluster, while Hanna is designed to be distributed with automatic sharding and data partitioning for linear scalability.
4. Programming Language Compatibility: Redis is mainly developed in C language with clients available in a wide range of languages, while Hanna is written in Erlang and supports integration with Erlang applications.
5. Cluster Management: Redis Cluster relies on external tools for cluster management, such as Redis Sentinel, while Hanna has built-in cluster management capabilities for ease of deployment and monitoring.
6. Replication Protocol: Redis uses its custom RESP protocol for replication, while Hanna uses the mature and widely adopted Distributed Erlang protocol for replicating data across nodes.

In Summary, Redis is primarily focused on simple key-value storage with some data structure support, while Hanna offers more complex data structures, full ACID compliance, distributed design, and built-in cluster management capabilities.