包阅导读总结
1. 关键词：Google Cloud Spanner、dual-region configuration、availability、outage、replicas
2. 总结：Google Cloud Spanner 推出双区域配置选项，每个区域有多个副本以维持可用性。但整个区域故障时数据库会失去可用性，需切换到单区域模式，谷歌会监测并自动切换确保可用。
3. 主要内容：
– Google Cloud Spanner 新增双区域配置选项
– 每个区域运行两个读写副本和一个见证副本
– 双区域配置下的可用性情况
– 区域内单个副本故障不影响可用性，因至少两个副本仍正常
– 整个区域故障会导致数据库失去可用性
– 恢复可用性的方式
– 数据库须切换到单区域模式，即单个区域内的三个副本
– 谷歌持续监测故障，自动切换并重新配置以确保可用性
思维导图：
文章来源：infoworld.com
作者：InfoWorld
发布时间：2024/7/23 16:10
语言：英文
总字数：623字
预计阅读时间：3分钟
评分：87分
标签：谷歌云,Spanner,双区域配置,数据驻留,云数据库
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Each region runs two read/write replicas and a witness replica to maintain availability, Sagar explained, adding that when a zonal outage occurs affecting any one replica in a region, Spanner, due to the dual-region configuration setup, would be able to maintain availability as at least two replicas would be functional.
However, the product manager pointed out that in the event that an entire region faces outage and enterprises are in dual-region configuration setup for Spanner, the databases will lose availability.
“To recover availability, databases must switch to single-region mode, consisting of three replicas in a single region,” Sagar wrote, adding that Google continuously monitors for outages and upon detection automatically fails over and reconfigures the dual-region setup to a single-region setup to ensure availability.
