Following the advice in this article, I have configured my applications to use region-specific Gremlin endpoints so that reads and writes are always directed to the master replica in the same data centre (the Cosmos DB account is multi-master and the applications are deployed to every region on AKS). My question is this: in the event of a regional Cosmos DB outage, what will the behaviour be when using region-specific Gremlin connection strings? Will applications that reference a regional endpoint that is affected by an outage be automatically redirected to a region where the Cosmos replica is healthy?
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This depends upon the client SDK the application is using to connect and the connection string logic. If the application connection string is pointed to the .NET SDK URI, then you will want to implement either the .NET SDK v2 or .NET SDK v3 multi-master functionality. If you are using the Gremlin Endpoint, please follow the specific guidance: Regional endpoints for Cosmos DB for Graph Accounts
Once that is configured correctly, in the event of an outage, the routing will automatically be redirected to an available write region.
Mike Ubezzi
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