Redis 事务 不是原子性的！

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单个Redis命令的执行是原子性的，但Redis没有在事务上增加任何维持原子性的机制，所以Redis事务的执行并不是原子性。

事务可以理解为一个打包的批量执行脚本，但批量执行并非原子化的操作，中间某条指令的失败不会导致前面已做指令的回滚，也不会造成后续指令不做。

这是官网上的说明 From redis docs on transactions:

It’s important to note that even when a command fails, all the other commands in the queue are processed – Redis will not stop the processing of commands.

比如：

test.toop.localdomain:6379> multi
OK
test.toop.localdomain:6379> set a aa
QUEUED
test.toop.localdomain:6379> set b bb
QUEUED
test.toop.localdomain:6379> set c cc
QUEUED
test.toop.localdomain:6379> exec
1) OK
2) OK
3) OK
test.toop.localdomain:6379> get a
"aa"
test.toop.localdomain:6379> get b
"bb"
test.toop.localdomain:6379> get c
"cc"
test.toop.localdomain:6379> 
test.toop.localdomain:6379> multi
OK
test.toop.localdomain:6379> set a aaa
QUEUED
test.toop.localdomain:6379> lpush b b b b b b
QUEUED
test.toop.localdomain:6379> set c ccc
QUEUED
test.toop.localdomain:6379> exec
1) OK
2) (error) WRONGTYPE Operation against a key holding the wrong kind of value
3) OK
test.toop.localdomain:6379> get a
"aaa"
test.toop.localdomain:6379> get b
"bb"
test.toop.localdomain:6379> get c
"ccc"
test.toop.localdomain:6379>