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Update redis集群以及应用场景.md

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docs/database/Redis/redis集群以及应用场景.md
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@ -37,7 +37,7 @@
#### 节点下线
- 客观下线
- 所有 Sentinel 节点对 Redis 节点失败要达成共识,即超过 quorum 个统一.
- 主管下线
- 主观下线
- 即 Sentinel 节点对 Redis 节点失败的偏见,超出超时时间认为 Master 已经宕机.
#### leader选举
- 选举出一个 Sentinel 作为 Leader:集群中至少有三个 Sentinel 节点,但只有其中一个节点可完成故障转移.通过以下命令可以进行失败判定或领导者选举.