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Cluster cluster addslots(集群 槽位) cluster count failure reports(集群計數(shù)失敗報告) cluster countkeysinslot cluster delslots cluster failover cluster forget cluster getkeysinslot cluster info cluster keyslot(集群鍵槽) cluster meet cluster nodes(集群節(jié)點) cluster replicate(集群復(fù)制) cluster reset(集群重置) cluster saveconfig cluster set config epoch cluster setslot cluster slaves cluster slots readonly readwrite Connection auth echo ping quit select swapdb Geo geoadd geodist geohash geopos georadius georadiusbymember Hashes hdel hexists hget hgetall hincrby hincrbyfloat hkeys hlen hmget hmset hscan hset hsetnx hstrlen hvals HyperLogLog pfadd pfcount pfmerge Keys del dump exists expire expireat keys migrate move object persist pexpire pexpireat pttl randomkey rename renamenx restore scan sort touch ttl type unlink wait Lists blpop brpop brpoplpush lindex linsert llen lpop lpush lpushx lrange lrem lset ltrim rpop rpoplpush rpush rpushx Pub/Sub psubscribe publish pubsub punsubscribe subscribe unsubscribe Scripting eval evalsha script debug script exists script flush script kill script load Server bgrewriteaof bgsave client getname client kill client list client pause client reply client setname command command count command getkeys command info config get config resetstat config rewrite config set dbsize debug object debug segfault flushall flushdb info lastsave monitor role save shutdown slaveof slowlog time Sets sadd scard sdiff sdiffstore sinter sinterstore sismember smembers smove spop srandmember srem sscan sunion sunionstore Sorted Sets zadd zcard zcount zincrby zinterstore zlexcount zrange zrangebylex zrangebyscore zrank zrem zremrangebylex zremrangebyrank zremrangebyscore zrevrange zrevrangebylex zrevrangebyscore zrevrank zscan zscore zunionstore Strings append bitcount bitfield bitop bitpos decr decrby get getbit getrange getset incr incrby incrbyfloat mget mset msetnx psetex set setbit setex setnx setrange strlen Transactions discard exec multi unwatch watch
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READONLY

自3.0.0起可用。

時間復(fù)雜度: O(1)

啟用讀取查詢以連接到 Redis 群集從屬節(jié)點。

通常,從屬節(jié)點會將客戶端重定向到授權(quán)主服務(wù)器以獲取給定命令中涉及的散列槽,但客戶端可以使用從服務(wù)器來使用 READONLY 命令來擴展讀取。

READONLY 告知 Redis 集群從節(jié)點客戶機愿意讀取可能過時的數(shù)據(jù),并且對運行寫查詢不感興趣。

當(dāng)連接處于只讀模式時,只有當(dāng)操作涉及從屬主節(jié)點未提供的密鑰時,群集才會向客戶端發(fā)送重定向。這可能是因為:

1. 客戶端發(fā)送了一個關(guān)于散列槽的命令,散列槽從來沒有被這個從設(shè)備的主設(shè)備所服務(wù)

2. 該集群已重新配置(例如重新綁定),從屬服務(wù)器不再能夠為給定的哈希槽提供命令。

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