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![String (sds)
struct sdshdr {
int len;
int free;
char buf[];
};
获取字符串长度, 常数复杂度
增长时空间预分配
惰性回收
shshdr
free
0
len
5
buf R E D ...](https://image.slidesharecdn.com/rediscode-160611010059/75/redis-4-2048.jpg?cb=1667996701)
![Hash table
通过渐进式rehash解决kv过多造成服务阻塞
流程:
给ht[1]分配至少2倍于ht[0]的空间
将ht[0]数据分批迁移到ht[1]
清空ht[0], 将ht[0]指针指向ht[1],ht[1]指针指向ht[0]
每次...](https://image.slidesharecdn.com/rediscode-160611010059/75/redis-5-2048.jpg?cb=1667996701)
![dictht
table
size
4
sizemask
3
userd
2
dict
type
…
ht
rehashidx
-1
dictht
table
size
8
sizemask
7
userd
dictEntry*[4]
0
1
...](https://image.slidesharecdn.com/rediscode-160611010059/75/redis-6-2048.jpg?cb=1667996701)
