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Update 4.storage-service.md #1834

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May 26, 2022
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Update 4.storage-service.md #1834

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2 changes: 1 addition & 1 deletion docs-2.0/1.introduction/3.nebula-graph-architecture/4.storage-service.md
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Expand Up @@ -188,7 +188,7 @@ pId = vid % numParts + 1;

分布式系统中，同一份数据通常会有多个副本，这样即使少数副本发生故障，系统仍可正常运行。这就需要一定的技术手段来保证多个副本之间的一致性。

基本原理：Raft 就是一种用于保证多副本一致性的协议。Raft 采用多个副本之间竞选的方式，赢得”超过半数”副本投票的（候选）副本成为 Leader，由 Leader 代表所有副本对外提供服务；其他 Follower 作为备份。当该 Leader 出现异常后（通信故障、运维命令等），其余 Follower 进行新一轮选举，投票出一个新的 Leader。Leader 和 Follower 之间通过心跳的方式相互探测是否存活，并以 Raft-wal 的方式写入硬盘，超过多个心跳仍无响应的副本会认为发生故障。
基本原理：Raft 就是一种用于保证多副本一致性的协议。Raft 采用多个副本之间竞选的方式，赢得”超过半数”副本投票的（候选）副本成为 Leader，由 Leader 代表所有副本对外提供服务；其他 Follower 作为备份。当该 Leader 出现异常后（通信故障、运维命令等），其余 Follower 进行新一轮选举，投票出一个新的 Leader。Leader 和 Follower 之间通过心跳的方式相互探测是否存活，并以 Raft-wal 的方式写入硬盘，超过多个心跳仍无响应的副本会被认为发生故障。

!!! Note

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