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Vitess

v23.0.4Storage & Data
May 7, 2026

v23.0.4 is a stability-focused patch release fixing multiple panics in VTOrc, VTGate, and ERS, plus critical VReplication and routing rule bugs that could silently misdirect traffic.

  • breakingUpgrade immediately if you use ERS or semi-sync replication

    Three separate ERS bugs were fixed: nil pointer panics during errant GTID detection, broken cancellation logic, and IO threads not restarting on replicas after ERS failure. Any of these can leave your cluster in a degraded state after a failover. If you run semi-sync with VTOrc, the ReplicationStopped + PrimarySemiSyncBlocked deadlock fix is equally critical — it could stall recovery entirely. Upgrade before your next planned maintenance window at the latest.

  • securityGo upgraded to 1.25.9 — check your custom builds

    The Go runtime was bumped from 1.25.8 to 1.25.9 within this release cycle. If you build Vitess from source or maintain custom images, rebuild against go1.25.9 to pick up any runtime-level fixes included in that Go patch release.

  • enhancementRouting rule and schema-tracker fix affects multi-keyspace setups

    VTGate was not rebuilding routing rules after schema-tracker updates, and was dropping the target keyspace during routing rule AST rewrites. Both are silent bugs — queries appear to work but may land on the wrong keyspace. If you use routing rules with multiple keyspaces, validate query routing behavior after upgrading to confirm traffic is going where you expect.

Key changes (5)

  • Fixed panic in VTOrc when handling ReplicationStopped + PrimarySemiSyncBlocked recovery simultaneously — a deadlock risk in HA scenarios
  • EmergencyReparentShard (ERS) fixes: nil pointer panic in errant GTID detection, broken cancellation in reparentReplicas(), and IO thread restart failures after ERS failure
  • VTGate: routing rules now correctly rebuild after schema-tracker updates, and target keyspace is preserved when routing rules rewrite table AST — both are silent correctness bugs
  • VTGate: buffer no longer restarts after shutdown, preventing potential connection storms during controlled restarts
  • Go runtime upgraded to go1.25.9, and vitessdriver now correctly returns string for binary result values (regression fix)
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