更改多区域Azure Cosmos DB中的订阅源读取区域

Question

我使用Cosmos DB多区域（单区域写入）帐户。目前，它在美国东部和西部启用。写入区域位于美国西部。在美国东部和西部都部署了变更源监听器。

鉴于这种设置，我想了解更改提要是如何工作的？

< li >更改摘要侦听器是否从其部署的区域接收更改摘要。例如，东方的听众从东方阅读，西方的听众从西方阅读。

或

我正在使用change feed处理器库读取change Feeds，代码如下：

var feedCollection = new DocumentCollectionInfo()
{
    DatabaseName = configurations.CosmosDb.DatabaseId,
    CollectionName = configurations.CosmosDb.CollectionId,
    Uri = new Uri(configurations.CosmosDb.EndpointUri),
    MasterKey = configurations.CosmosDb.AuthKey
};
var leaseCollection = new DocumentCollectionInfo()
{
    DatabaseName = configurations.LeaseCollection.DatabaseId,
    CollectionName = configurations.LeaseCollection.CollectionId,
    Uri = new Uri(configurations.CosmosDb.EndpointUri),
    MasterKey = configurations.CosmosDb.AuthKey
};

var builder = new ChangeFeedProcessorBuilder();
var processor = builder
    .WithHostName(hostName)
    .WithFeedCollection(feedCollection)
    .WithLeaseCollection(leaseCollection)
    .WithObserverFactory(observerFactory)
    .BuildAsync().Result;

Answer 1

默认情况下，将从写入区域(美国西部)读取更改。如果希望从另一个区域读取更改，只需使用< code > DocumentCollectionInfo 中的< code>ConnectionPolicy设置，如下所示:

ConnectionPolicy regionalPolicy = new ConnectionPolicy();
regionalPolicy.PreferredLocations.Add("East US");
var feedCollection = new DocumentCollectionInfo()
{
    DatabaseName = configurations.CosmosDb.DatabaseId,
    CollectionName = configurations.CosmosDb.CollectionId,
    Uri = new Uri(configurations.CosmosDb.EndpointUri),
    MasterKey = configurations.CosmosDb.AuthKey,
    ConnectionPolicy = regionalPolicy
};