You don't need to restart the Zero server this time to test the feature.
这次无需重启zero服务器就可以测试此特性。
To enable this feature, change the null values to zero.
要启用该特性,将null值改为0。
Using the rolling upgrade feature allows you to upgrade the cluster with zero or minimal down time.
使用滚动升级特性允许您使用最少的、甚至零停机时间升级集群。
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