We are copying data from West US 2 to North Europe using Azure Data factory. From Azure Data Factory, we see that around 104 MB of data was copied before the pipeline failed with Timeout Exception:
Type=Microsoft.Azure.Documents.RequestTimeoutException,Message=Request timed out.\r\nActivityId: ebac173e-97a9-4012-85ae-6e86aabd6ab3, Request URI: /dbs/+HxXAA==/colls/+HxXAKY0To8=/docs, RequestStats: , SDK: documentdb-dotnet-sdk/2.5.1 Host/64-bit MicrosoftWindowsNT/6.2.9200.0,Source=Microsoft.Azure.Documents.Client,''Type=System.Threading.Tasks.TaskCanceledException,Message=A task was canceled.,Source=mscorlib
From metrics in cosmos db in north europe, we see the number of partitions increased from 2 to 50 for this copy activity. As a result, the RU per partition dropped considerably.
100 Mb of data should ideally not increase the number of partitions to 50. What might be going wrong here ?