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Raft Node Rejoin Bug

2025-11-20 · Zhang Yanpo (drdr.xp)

Analyzes a replication session isolation bug in Raft implementations. When a node rejoins the cluster within the same term, delayed AppendEntries responses can corrupt progress tracking, causing infinite retry loops. While data safety remains intact, it creates operational issues like resource exhaustion. Uses raft-rs as a case study to examine trigger conditions and solutions.

The Hidden Danger in Raft: Why IO Ordering Matters

2025-10-02 · Zhang Yanpo (drdr.xp)

Writing logs before persisting term in Raft can silently destroy committed data. Here’s why production systems like TiKV and HashiCorp Raft carefully control IO order—and three battle-tested solutions.