Understanding Undermoon’s Chunk: Building Balanced Redis Clusters in Rust
The article explains how Undermoon’s Chunk, composed of two proxies and four Redis nodes spread across two machines, forms the core building block for a balanced Redis cluster topology and load‑balancing strategy, detailing its node layout, failover behavior, and simple allocation algorithm.
Chunkis the basic building block of an Undermoon Redis cluster. It provides a structured topology for workload balancing and consists of 2 proxy processes and 4 Redis nodes evenly distributed across two physical machines.
In a typical deployment the first half of the chunk contains 1 master node and 1 replica; the peer nodes reside in the second half.
If the second half fails, all Redis nodes in the first half are promoted to master role.
Chunk Allocation
Undermoon does not employ a complex scheduling strategy. It uses a simple Redis‑node allocation algorithm to achieve load balancing:
Master nodes should be evenly spread across all machines.
After a failover, the traffic surge from the failed master must be evenly distributed across all machines in the cluster.
The algorithm details and formal proof are documented in the chunk allocation file:
https://github.com/doyoubi/undermoon/blob/master/docs/chunk_allocation.txt
The node allocation algorithm aims to assign node blocks to achieve maximum balance, i.e., to distribute the failover of lost masters as widely as possible across the entire cluster.
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