High-availability in-memory key-value store using RDMA and Optane DCPMM

In this paper, we propose a fast high-availability in-memory key-value store based on RDMA network and Optane DCPMM named FaHA. FaHA proposes RDMA persist PRC that enables remote data persistence for fast log shipping with minimal round-trip and persistence overhead. FaHA further designs append-only storage with pipeline batching scheme in NVM and a hotness-aware differential hash index in DRAM to relieve read/write amplification of Optane DCPMM. Evaluations show that FaHA supports up to 2–3 synchronous backups without significantly lowering the primary’s performance, and outperforms existing works.