JedisCluster and Read Replicas

[Al Roche]

Hi,

I am having a problem with JedisCluster connecting to an Elasticache Cluster Mode redis cluster with 2 shards, - each shard has a Primary node and a Read-only Replica. 

However, I can only see requests (hits or misses) going to the primary in each cluster. I expected to see reads (and hence hits and misses in the graphs) going to the read-only replicas.

I created a JedisCluster instance passing in only the configuration endpoint of the cluster. I expected it to discover primary and also the Read Replica nodes in the cluster.

What am I missing here?

Do I need to do something extra to somehow send reads to the read replicas in each shard?

I am somewhat stumped on this, and there doesn't seem to be much documentation on the subject so any help appreciate.

Thanks,

Al

[Al Roche]

Hi,

I am connecting to an Elasticache Redis Cluster using JedisCluster via the Redis Cluster Configuration endpoint.

The cluster has 2 shards, each with a Primary/Write node and a read replica.

When I send requests the to cluster it does work, but I do not see any hits on the read replicas, only on the primary in each of the 2 shards. What am i doing wrong here?

Any help sincerely appreciated as i am stumped on this. I expected to see reads hitting the replicas.

Thanks,

Al.

 

[Sazzadul Hoque]

So far, JedisCluster only supports reading from master.

PS: It hasn't been very long since Redis started supporting read from cluster replicas.

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[Alan Roche]

Thanks for the clarification here. So presumably in this context the replicas are basically warm standbys for HA.

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