At the sentry sentinel In mechanism , Can solve redis High availability problem , When master After failure, it can automatically change slave Upgrade to master, So as to guarantee redis The normal use of the service , But it can't be solved redis The bottleneck of single machine write , Stand alone redis Write performance is limited by the memory size of a single machine 、 Concurrent number 、 Network card speed and other factors .
Redis Cluster The characteristics are as follows ：
- all Redis Node usage (PING Mechanism ) interconnection
- Whether a node in the cluster fails , More than half of the nodes in the whole cluster fail to monitor , It's a real failure
- Client does not need proxy You can connect directly to redis, The application needs to be configured with all redis The server IP
- redis cluster Put all the redis node Average maps to 0-16383 Slots (slot) On , Read and write to the specified redis node Operation on top , So how many redis node amount to redis How many times has concurrency been extended , Every redis node To undertake 16384/N Slots
- Redis cluster Pre allocation 16384 individual (slot) Slot position , When need is in redis Write a key -value When , Will use CRC16(key) mod 16384 The value after , It was decided that key Which slot of the value is written to determine which one to write Redis Node , So as to effectively solve the single machine bottleneck .
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