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I'm setting up a simple 1 Master - N Slaves Redis cluster (low write round, high read count). How to set this up is well documented on the Redis website, however, there is no information (or I missed it) about how the clients (Node.js servers in my case) handle the cluster. Do my servers need to have 2 Redis connections opened: one for the Master (writes) and one towards a Slave load-balancer for reads? Does the Redis driver handle this automatically and send reads to slaves and writes to the Master?
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The Redis replication uses an asynchronous method to transfer data from master to slave. The slave periodically acknowledges the received data sent by the master node, and also the master node can have many slaves. Redis can support cascading replication, so the slave can be connected to another slave.
Open the Command Prompt and change to the Redis directory and run the command c:\Redis>redis-cli -h Redis_Cluster_Endpoint -p 6379 . Run Redis commands. You are now connected to the cluster and can run Redis commands like the following.
Redis Cluster provides a way to run a Redis installation where data is automatically sharded across multiple Redis nodes. Redis Cluster also provides some degree of availability during partitions, that is in practical terms the ability to continue the operations when some nodes fail or are not able to communicate.
The only approach I found was using thunk-redis library. This library supports connecting to Redis master-slave without having a cluster configured or using a sentinel.
You just simply add multiple IP addresses to the client:
const client = redis.createClient(['127.0.0.1:6379', '127.0.0.1:6380'], {onlyMaster: false});
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