{
  "id": "redis/sentinel-arbiter-unreachable",
  "signature": "SENTINEL: arbiter node unreachable, failover delayed",
  "signature_zh": "SENTINEL：仲裁节点不可达，故障转移延迟",
  "regex": "SENTINEL: arbiter node unreachable.*",
  "domain": "redis",
  "category": "network_error",
  "subcategory": null,
  "root_cause": "The Sentinel instance cannot communicate with the arbiter node, which is crucial for achieving quorum in failover decisions.",
  "root_cause_type": "generic",
  "root_cause_zh": "Sentinel 实例无法与仲裁节点通信，而仲裁节点对于故障转移决策中达成法定人数至关重要。",
  "versions": [
    {
      "version": "Redis 6.2",
      "introduced": null,
      "deprecated": null,
      "removed": null,
      "behavior_change": null,
      "status": "active"
    },
    {
      "version": "Redis 7.0",
      "introduced": null,
      "deprecated": null,
      "removed": null,
      "behavior_change": null,
      "status": "active"
    },
    {
      "version": "Redis 7.2",
      "introduced": null,
      "deprecated": null,
      "removed": null,
      "behavior_change": null,
      "status": "active"
    }
  ],
  "os_specific": {},
  "dead_ends": [
    {
      "action": "Increase sentinel monitor quorum to 3 to tolerate more failures",
      "why_fails": "Does not fix the network issue; may delay failover further if more nodes are unreachable.",
      "fail_rate": 0.4,
      "condition": "",
      "sources": []
    },
    {
      "action": "Remove the arbiter node from the Sentinel configuration",
      "why_fails": "Reduces redundancy; if other nodes fail, quorum may not be reached, causing no failover.",
      "fail_rate": 0.5,
      "condition": "",
      "sources": []
    }
  ],
  "workarounds": [
    {
      "action": "Check network connectivity to the arbiter node: ping <arbiter-ip> and ensure firewall rules allow Sentinel traffic (port 26379).",
      "success_rate": 0.9,
      "how": "Check network connectivity to the arbiter node: ping <arbiter-ip> and ensure firewall rules allow Sentinel traffic (port 26379).",
      "condition": "",
      "sources": []
    },
    {
      "action": "Restart the Sentinel service on the affected node: systemctl restart sentinel (or redis-sentinel restart).",
      "success_rate": 0.7,
      "how": "Restart the Sentinel service on the affected node: systemctl restart sentinel (or redis-sentinel restart).",
      "condition": "",
      "sources": []
    }
  ],
  "workarounds_zh": [
    "检查与仲裁节点的网络连接：ping <arbiter-ip> 并确保防火墙规则允许 Sentinel 流量（端口 26379）。",
    "在受影响的节点上重启 Sentinel 服务：systemctl restart sentinel（或 redis-sentinel restart）。"
  ],
  "transition_graph": {
    "leads_to": [],
    "preceded_by": [],
    "frequently_confused_with": []
  },
  "official_doc_url": "https://redis.io/docs/latest/operate/oss_and_stack/management/sentinel/",
  "official_doc_section": null,
  "error_code": null,
  "verification_tier": "ai_generated",
  "confidence": 0.87,
  "fix_success_rate": 0.88,
  "resolvable": "true",
  "first_seen": "2024-06-01",
  "last_confirmed": "2024-06-01",
  "last_updated": "2024-06-01",
  "evidence_count": 1,
  "tags": [],
  "locale": "en",
  "aliases": []
}