[BUG] "Loading RDB produced by version 255.255.255", the "version 255.255.255" is wrong.

[zhuleiandy888]

Describe the bug

Loading RDB produced by version 255.255.255

Log context

123209:123209:C 23 Apr 2025 16:53:12.273 # oO0OoO0OoO0Oo KeyDB is starting oO0OoO0OoO0Oo
123209:123209:C 23 Apr 2025 16:53:12.273 # KeyDB version=6.3.4, bits=64, commit=7e7e5e57, modified=0, pid=123209, just started
123209:123209:C 23 Apr 2025 16:53:12.273 # Warning: no config file specified, using the default config. In order to specify a config file use ./src/keydb-server /path/to/keydb.conf
123209:123209:C 23 Apr 2025 16:53:12.273 # WARNING overcommit_memory is set to 0! Background save may fail under low memory condition. To fix this issue add 'vm.overcommit_memory = 1' to /etc/sysctl.conf and then reboot or run the command 'sysctl vm.overcommit_memory=1' for this to take effect.
123209:123209:M 23 Apr 2025 16:53:12.274 * Increased maximum number of open files to 10032 (it was originally set to 1024).
123209:123209:M 23 Apr 2025 16:53:12.274 * monotonic clock: POSIX clock_gettime
                                                                      
                  _                                                   
               _-(+)-_                                                
            _-- /   \ --_                                            
         _--   /     \   --_            KeyDB  6.3.4 (7e7e5e57/0) 64 bit     
     __--     /       \     --__                                     
    (+) _    /         \    _ (+)       Running in standalone mode
     |   -- /           \ --   |        Port: 6379
     |     /--_   _   _--\     |        PID: 123209
     |    /     -(+)-     \    |                                     
     |   /        |        \   |        https://docs.keydb.dev       
     |  /         |         \  |                                     
     | /          |          \ |                                     
    (+)_ -- -- -- | -- -- -- _(+)                                     
        --_       |       _--                                         
            --_   |   _--                                             
                -(+)-        
                                                                     
123209:123209:M 23 Apr 2025 16:53:17.354 # WARNING: The TCP backlog setting of 511 cannot be enforced because /proc/sys/net/core/somaxconn is set to the lower value of 128.
123209:123209:M 23 Apr 2025 16:53:17.354 # Server initialized
123209:123209:M 23 Apr 2025 16:53:17.354 * Loading RDB produced by version 255.255.255
123209:123209:M 23 Apr 2025 16:53:17.354 * RDB age 3543 seconds
123209:123209:M 23 Apr 2025 16:53:17.354 * RDB memory usage when created 4.59 Mb
123209:123209:M 23 Apr 2025 16:53:17.354 # Done loading RDB, keys loaded: 0, keys expired: 0.
123209:123209:M 23 Apr 2025 16:53:17.354 * DB loaded from disk: 0.000 seconds
123209:123218:M 23 Apr 2025 16:53:17.356 * Thread 0 alive.

Additional information

127.0.0.1:6379> info server

redis_version:6.3.4
redis_git_sha1:7e7e5e57
redis_git_dirty:0
redis_build_id:e07f10cdfefa76a9
redis_mode:standalone
os:Linux 4.19.90-2107.6.0.0251.43.oe1.bclinux.x86_64 x86_64
arch_bits:64
multiplexing_api:epoll
atomicvar_api:atomic-builtin
gcc_version:7.3.0

install cmd:

git clone https://github.com/Snapchat/KeyDB.git
cd KeyDB/
git switch main
git checkout v6.3.4

git branch
* (HEAD detached at v6.3.4)
  main

make && make install

[keithchew]

keydb reads the RDB version from the aux header field in the RDB file, Either you have a corrupted RDB, or one produced by an incompatible redis. In my version, I have:

Loading RDB produced by version 6.3.4

which is from an RDB produced by keydb itself.

Since 6.3.4 is quite old now comparted to versions 7 or 8 in redis, it could also be there are changes there.