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The current stable version of Redis is 6. Many Linux distros still ship with version 5. Both talk protocol version 2. Version 6 also supports protocol version 3. The main differences are:
Name-Value), while version 2 exchanges hashes as a list of alternating names and values. This is visible to the user. High level predicates such as redis_get_hash/3 deal with both representations.
New projects are encouraged to use Redis version 6 with the version 3 protocol. See redis_server/3.