Azure Cosmos DB
An Azure NoSQL database service for app development.
Status code 449 on read-only workload
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Paul Hickman
1
Reputation point
I am running a batch process using version 3.8 of the .Net core client SDK to access Cosmos DB with an entirely read-only workload; no write operations are occurring on the cosmos account at the time this process is running.
In the metrics reports in Azure Portal, I'm seeing the expected ~25,000/min status code 200 responses to my queries but I'm also seeing around 0 to 2,500/min status code 449 responses. These aren't reaching my code as the .Net client SDK is handling the retry logic so I don't know what queries cause them.
However, according to the documentation status code 449 is only possible for write operations.
Does anyone know why I'm seeing it in my metrics during a read only workload?
Azure Cosmos DB
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KalyanChanumolu-MSFT 8,361 Reputation points2020-06-04T12:46:10.057+00:00 This is strange.
Are there any other clients connected to the same Cosmos instance that could be firing write operations? -
Paul Hickman 1 Reputation point
2020-06-04T21:52:38.357+00:00 No. All our writes happen in a batch at 7am each day and is all read-only the rest of the day and we get these 449s 24x7.
I've done some more investigation and it looks like they only show up when I add the metrics to a Dashboard in Azure Portal. I add a chart with:
Scope = My cosmos instance
Namespace = CosmosDB Standard Metrics
Metric = Total Requests
Spilt By = Status CodeHowever, if I look at the Metrics tab in the CosmosDB blade itself for the time window, I only see 200s.
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KalyanChanumolu-MSFT 8,361 Reputation points
2020-06-19T07:58:53.577+00:00 This will need deeper investigation and perhaps access to your Cosmos instance and logs.
Please reach out to Azure Support so that an engineer can work with you and help you resolve the issue. -
Mike Ubezzi 2,776 Reputation points2020-06-25T18:50:02.047+00:00 Hi @Paul Hickman - Did you manage to create a support request for this issue, or do you need assistance? I think your situation warrants further investigation through support. If you do not have a support plan, there are other options to have this issue investigated further. Thank you!!
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