Redis Can't handle RDB format version 9
刚开始编译安装，有如下操作：
cp redis-benchmark redis-cli redis-server /usr/bin/
后来用dnf install redis，然后启动redis 报错:
marco@pc01:~$ redis-server
11700:C 18 Apr 08:18:52.007 # oO0OoO0OoO0Oo Redis is starting oO0OoO0OoO0Oo
11700:C 18 Apr 08:18:52.007 # Redis version=4.0.9, bits=64, commit=00000000, modified=0,
pid=11700, just started
11700:C 18 Apr 08:18:52.007 # Warning: no config file specified, using the default config. In
order to specify a config file use redis-server /path/to/redis.conf
11700:M 18 Apr 08:18:52.007 * Increased maximum number of open files to 10032 (it was
originally set to 1024).
_._
_.-``__ ''-._
_.-`` `. `_. ''-._ Redis 4.0.9 (00000000/0) 64 bit
.-`` .-```. ```/ _.,_ ''-._
( ' , .-` | `, ) Running in standalone mode
|`-._`-...-` __...-.``-._|'` _.-'| Port: 6379
| `-._ `._ / _.-' | PID: 11700
`-._ `-._ `-./ _.-' _.-'
|`-._`-._ `-.__.-' _.-'_.-'|
| `-._`-._ _.-'_.-' | http://redis.io
`-._ `-._`-.__.-'_.-' _.-'
|`-._`-._ `-.__.-' _.-'_.-'|
| `-._`-._ _.-'_.-' |
`-._ `-._`-.__.-'_.-' _.-'
`-._ `-.__.-' _.-'
`-._ _.-'
`-.__.-'
11700:M 18 Apr 08:18:52.008 # Server initialized
11700:M 18 Apr 08:18:52.008 # Can't handle RDB format version 9
11700:M 18 Apr 08:18:52.008 # Fatal error loading the DB: Invalid argument. Exiting.
解决办法：
在整个文件系统中搜索dump.rdb：
sudo find / -name * .rdb
删除dump.rdb文件。
注意：rdb格式版本9在文件开头将带有以下字符串-REDIS0009