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doc: 阅读mysql group replication文档

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wu xiangkai
2025-10-17 15:43:56 +08:00
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mysql/mysql集群/Mysql Group Replication.md
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@@ -16,6 +16,7 @@
- [Version Compatibility](#version-compatibility) - [Version Compatibility](#version-compatibility)
- [Group Membership](#group-membership) - [Group Membership](#group-membership)
- [group\_replication\_member\_expel\_timeout](#group_replication_member_expel_timeout) - [group\_replication\_member\_expel\_timeout](#group_replication_member_expel_timeout)
- [Failure detection](#failure-detection)
# Mysql Group Replication # Mysql Group Replication
@@ -240,4 +241,5 @@ group members不仅需要对事务的提交达成一致，也需要对当前的v
##### group_replication_member_expel_timeout ##### group_replication_member_expel_timeout
通过`group_replication_member_expel_timeout`的system variable，引入了一个waiting period，允许members该时间内重新连接到group，从而避免被从group中驱逐。如果member在该时间范围内重新连接到了group，那么该member可以重新在group中处于活跃状态。但是，当member超过expel timeout并且从group中被驱逐时，或通过`STOP GROUP_REPLICATION`语句停止group replication时，或server failure时，其必须作为新的实例加入到group中。 通过`group_replication_member_expel_timeout`的system variable，引入了一个waiting period，允许members该时间内重新连接到group，从而避免被从group中驱逐。如果member在该时间范围内重新连接到了group，那么该member可以重新在group中处于活跃状态。但是，当member超过expel timeout并且从group中被驱逐时，或通过`STOP GROUP_REPLICATION`语句停止group replication时，或server failure时，其必须作为新的实例加入到group中。
### Failure detection
group replication failure detection mechanism是一个分布式的service，用于检测group中server没有和其他servers沟通的情况，从而判定该server有停止服务的嫌疑。如果在group的共识中该嫌疑为true，那么group将会做出协调一致的决定，将该member逐出group。