What I want to do
I have set up an HA Dgraph cluster(i.e 3 zeros and 3 alphas) on EKS. it is working fine but I want to add/scale-up 1 or 2 more alpha on the cluster.
What I did
I have added 4th alpha and it shows in my cluster but it actually doesn’t act as an independent node. for e.g, I have 153GB of data on three alpha nodes but when I add the 4th alpha in my cluster, data doesn’t copy on it. only 2.2GB of space filled on it and when I fired multiple queries then only three alpha nodes serve queries but 4th alpha sits ideal doesn’t take the load. no CPU and memory utilization is visible on the 4th alpha.
If any node among 3 alpha nodes goes down then only the 4th alpha comes in the picture and data starts copying on it.
please let me know how it works internally? how it servers query?
is there any way to scale up the existing 6 nodes cluster or we have to specify the replicas initially while setting up the cluster only or is there any way to add replicas in the existing cluster?
because if we add more alphas on the existing cluster it acts as sharding it doesn’t act as an independent node.