ValkeyJSON is not RDB compatible with ReJSON 2.8 or later

[joehu21]

Up to ReJSON v2.6.12, ValkeyJSON is RDB compatible with ReJSON, after issue #19 is resolved. Starting ReJSON v2.8, ReJSON had an RDB format change that broke the compatibility.

Trying to load a ReJSON v2.8.3 RDB using ValkeyJSON:

  7131:M 06 Dec 2024 17:12:06.150 * Module 'json' loaded from /home/jowhuw/github/joehu21-valkeyJSON/build/src/libjson.so
  7131:M 06 Dec 2024 17:12:06.150 * Server initialized
  7131:M 06 Dec 2024 17:12:06.150 # Can't handle RDB format version 12
  7131:M 06 Dec 2024 17:12:06.150 # Fatal error loading the DB, check server logs. Exiting.

Recommendation:
For now, we should at least update our documentation to state that ValkeyJSON is RDB compatible with ReJSON up to v2.6.12. It's unknown if we can still maintain the compatibility with ReJSON v2.8 and later.

[roshkhatri]

Backward compatibility till 2.6.12 is resolved by #19

We need to discuss if we want to be compatible with ReJSON v2.8

[joehu21]

This is actually expected. ReJSON v2.8 uses redis 7.2.1. ValkeyJSON makes no commit of RDB compatibility with ReJSON beyond Redis 7.2, which is no longer an open source.

[joehu21]

Closed the issue because ValkeyJSON makes no commit of RDB compatibility with ReJSON v2.8 or later that is beyond the last OSS Redis version - 7.1. ValkeyJSON is only RDB-compatible with ReJSON v1.0.8 to v2.6.12.