主从复制架构下,默认Slave是只读的,如果写入则会报错:

127.0.0.1:6379> set foo bar (error) READONLY You can't write against a read only slave. 

注意这个行为是可以修改的,虽然这样的修改没有意义:

127.0.0.1:6379> CONFIG SET slave-read-only no OK 127.0.0.1:6379> set foo bar OK