redis集群模式-key分配一个slot
2021/5/7 19:25:16
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集群模式key的含有{}的情况会计算{}中的crc16|64的值。如果用{prefix}做前缀会分配到一个slot。
/* ----------------------------------------------------------------------------- * Key space handling * -------------------------------------------------------------------------- */ /* We have 16384 hash slots. The hash slot of a given key is obtained * as the least significant 14 bits of the crc16 of the key. * * However if the key contains the {...} pattern, only the part between * { and } is hashed. This may be useful in the future to force certain * keys to be in the same node (assuming no resharding is in progress). */ static unsigned int clusterManagerKeyHashSlot(char *key, int keylen) { int s, e; /* start-end indexes of { and } */ for (s = 0; s < keylen; s++) if (key[s] == '{') break; /* No '{' ? Hash the whole key. This is the base case. */ if (s == keylen) return crc16(key,keylen) & 0x3FFF; /* '{' found? Check if we have the corresponding '}'. */ for (e = s+1; e < keylen; e++) if (key[e] == '}') break; /* No '}' or nothing between {} ? Hash the whole key. */ if (e == keylen || e == s+1) return crc16(key,keylen) & 0x3FFF; /* If we are here there is both a { and a } on its right. Hash * what is in the middle between { and }. */ return crc16(key+s+1,e-s-1) & 0x3FFF; }
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