Redis Standard Edition (CKV)

Last updated: 2020-01-14 12:45:42


About CKV Master/Slave

  • Overview of CKV engine: Tencent Cloud CKV engine is a high-performance, low-latency and persistent distributed KV storage service independently developed by Tencent Cloud. It is widely used in Tencent's WeChat, open platform, Tencent Cloud, Tencent Game and e-commerce platforms, with more than one trillion visits per day. Tencent Cloud provides CKV Master/Slave and CKV Cluster, allowing flexible deployment in different business scenarios.

  • Overview of CKV Master/Slave: CKV Master/Slave uses master/slave node deployment architecture to provide data persistence and backup. It is suitable for scenarios that require data reliability and availability. The Master node provides daily service access and the Slave node provides HA (high availability). When the Master node fails, the system automatically switches the service to the Slave node to ensure the smooth business operation. CKV Master/Slave is compatible with Redis 3.2 commands and protocols, supporting the specifications of 4-384 GB to meet the mass storage needs.

Features of CKV Master/Slave

  • Robust service

    Adopts the master/slave backup architecture, with the master/slave nodes located on different physical servers. The master node supports external access. You can add, delete, modify and query data through Redis command lines and general clients. The slave node provides data backup and high availability. When the master node fails, the self-developed HA system automatically switches the service to the slave node to ensure the smooth business operation.
  • Reliable data

    The data persistence feature is enabled by default, and all data is stored to disks. It provides the data backup feature. You can roll back or clone instances using the corresponding backup set, so as to avoid misoperation on data.
  • Lower latency

    CKV uses a high-performance network platform and a proxy-free architecture, greatly reducing access delay and network delay. The delay can be reduced as much as 60% in high load scenarios.
  • Read-only slave

    CKV Master/Slave can improve the read performance by 40% in average by enabling the slave. Read-only Slave is disabled by default in CKV Master/Slave, and can be applied for by submitting tickets. Since might be a replication delay between CKV master and slave nodes, data from earlier versions may be read with the "Read-only Slave" enabled. Before enabling this feature, make sure it is acceptable to read inconsistent data.
  • Smooth upgrade

    With unique schemes, CKV Master/Slave can ensure the business-unaware version upgrade, thus maximizing the service availability.

Use limits

  • CKV Master/Slave supports the maximum performance of up to over 120,000 QPS. If you need higher QPS, select CKV Cluster, which supports up to 10 million QPS.
  • In CKV, the expiration time in milliseconds set by PTTL is displayed in the smallest unit (in sec), which is different with Redis Community.
  • For the Key of string type supported in CKV, the maximum size of the value is 32 MB, which is different with Redis Community.

Connection example

CKV Master/Slave only supports the password format: "Instance id:password". For example, if your instance ID is crs-bkuza6i3 and the password is abcd1234, the connection command is redis-cli -h IP address -p port -a crs-bkuza6i3:abcd1234.


  • Commands supported in CKV Master/Slave
connection family geo family hashes family hyperloglog family keys family lists family pub/sub family server family
auth geoadd hdel pfadd del lindex psubscribe command
echo geohash hexists pfcount scan linsert pubsub dbsize
ping geopos hget pfmerge exists llen publish info
quit geodist hgetall expire lpop punsubscribe time
select georadius hincrby expireat lpush subscribe
georadiusbymember hincrbyfloat keys lpushx unsubscribe
hkeys type lrange
hlen move lrem
hmget ttl lset
hmset persist ltrim
hset pexpire rpop
hsetnx pexpireat rpoplpush
hstrlen pttl rpush
hvals randomkey rpushx
hscan rename
sets family sorted sets family strings family transactions family
sadd zadd append discard
scard zcard bitcount exec
sdiff zcount bitop multi
sdiffstore zincrby bitpos unwatch
sinter zinterstore decr watch
sinterstore zlexcount decrby
sismember zrange get
smembers zrangebylex getbit
smove zrangebyscore getrange
spop zrank getset
srandmember zrem incr
srem zremrangebylex incrby
sscan zremrangebyrank incrbyfloat
sunion zremrangebyscore mget
sunionstore zrevrange mset
zrevrangebylex msetnx
zrevrangebyscore psetex
zrevrank set
zscan setbit
zscore setex
zunionstore setnx
  • Commands not supported in CKV Master/Slave
cluster family connection family keys family lists family scripting family server family strings family
cluster addslots swapdb touch blpop eval bgrewriteaof bitfield
cluster count-failure-reports restore brpop evalsha bgsave
cluster countkeyinslot object brpoplpush script debug client kill
cluster delslots unlink script exists client list
cluster failover wait script flush client getname
cluster forget migrate script kill client pause
cluster getkeysinslot dump script load client reply
cluster info client setname
cluster keyslot command count
cluster meet command getkeys
cluster nodes command info
cluster replicate config get
cluster reset config rewrite
cluster saveconfig config set
cluster set-config-epoch config resetstat
cluster setslot debug object
cluster slaves debug segfault
cluster slots flushall
readonly flushdb
readwrite lastsave