Quorum Variations
Understand how quorum variations influence replication in distributed systems by exploring strict and sloppy quorums. Learn how data is managed across node subsets and how techniques like hinted handoff and read repair ensure availability and consistency in large-scale clusters.
We'll cover the following...
So far we have examined what is called a strict quorum in contrast to a sloppy quorum which we’ll discuss next. Consider a system composed of several dozen nodes. It may not make sense to replicate each data value to every node so we may choose a subset of nodes in the cluster for replicating each value instead of replicating the values on every node in the cluster. Going back to our inequality R + W > N, the N in this scenario is less than the number of nodes in the cluster.
When a network partition takes place, it can happen that the chosen subset of nodes where we want to replicate a given value is not reachable partially. However, other nodes in the ...