Sohu Tech Products
Feb 21, 2024 · Operations
Troubleshooting and Recovery of ZooKeeper Election Port Failure in a Codis Cache Cluster
When adding a ZooKeeper observer to a Codis cache cluster, the election port (3888) was unreachable because the QuorumCnxManager listener thread vanished, prompting telnet and log checks, and leading to a successful recovery by rolling upgrade to ZooKeeper 3.4.13, rebuilding the data directory, performing a rolling restart, and decommissioning the temporary node, thereby restoring full cluster quorum and normal Codis‑Proxy operation.
Cluster RecoveryQuorumCnxManagerVersion Upgrade
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