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High CPU usage telemetry_upload.py when no internet connection

See original GitHub issue

I lost internet connectivity while our software was trying to run az for keyvault lookups. Then this happened:

Environment summary

az --version = 2.0.17
Windows 10 v1607 (OS Build 14393.1944)

Full command-line for one of those processes:

"C:\Program Files (x86)\Microsoft SDKs\Azure\CLI2\python.exe" "C:\Program Files (x86)\Microsoft SDKs\Azure\CLI2\lib\site-packages\azure\cli\core\telemetry_upload.py" "[{\"name\": \"azurecli/commands/keyvault-secret-show\", \"properties\": {\"Reserved.DataModel.EntityType\": \"UserTask\", \"Reserved.DataModel.Action.Type\": \"Atomic\", \"Reserved.DataModel.Action.Result\": \"Failure\", \"Reserved.ChannelUsed\": \"AI\", \"Reserved.EventId\": \"c1ff0ae4-b3d5-4218-823c-dcb91db4dc26\", \"Reserved.SequenceNumber\": 1, \"Reserved.SessionId\": \"a1cee7d3-0840-4ffd-a406-4dbc10d725d7\", \"Reserved.TimeSinceSessionStart\": 0, \"Reserved.DataModel.Source\": \"DataModelAPI\", \"Reserved.DataModel.EntitySchemaVersion\": 4, \"Reserved.DataModel.Severity\": 0, \"Reserved.DataModel.ProductName\": \"azurecli\", \"Reserved.DataModel.FeatureName\": \"commands\", \"Reserved.DataModel.EntityName\": \"keyvault-secret-show\", \"Reserved.DataModel.CorrelationId\": \"6f619da6-dd28-4192-bdca-cede461a046c\", \"Context.Default.VS.Core.ExeName\": \"azurecli\", \"Context.Default.VS.Core.ExeVersion\": \"2.0.16@none\", \"Context.Default.VS.Core.MacAddressHash\": \"5da9c032f0f44a0c1510177db732ab61c521995612e7777d6d52385e0782de2e\", \"Context.Default.VS.Core.Machine.Id\": \"5da9c032-f0f4-4a0c-1510-177db732ab61\", \"Context.Default.VS.Core.OS.Type\": \"windows\", \"Context.Default.VS.Core.OS.Version\": \"10.0.14393\", \"Context.Default.VS.Core.User.Id\": \"6d047a0a-98c9-11e7-832e-6c4008a83ec5\", \"Context.Default.VS.Core.User.IsMicrosoftInternal\": \"False\", \"Context.Default.VS.Core.User.IsOptedIn\": \"True\", \"Context.Default.VS.Core.TelemetryApi.ProductVersion\": \"azurecli@2.0.16\", \"Context.Default.AzureCLI.Source\": \"az\", \"Context.Default.AzureCLI.ClientRequestId\": \"e9249d12-f61f-11e7-b16d-6c4008a83ec4\", \"Context.Default.AzureCLI.CoreVersion\": \"2.0.16\", \"Context.Default.AzureCLI.InstallationId\": \"6d047a0a-98c9-11e7-832e-6c4008a83ec5\", \"Context.Default.AzureCLI.ShellType\": \"cmd\", \"Context.Default.AzureCLI.UserAzureId\": \"42fb4f40fed79ba0dac131b56a0ffc9890ea8e9158cbb2ce3a156c54f8f8ec4c\", \"Context.Default.AzureCLI.UserAzureSubscriptionId\": \"00abbc18-78e7-4052-9a0f-84076b2737f3\", \"Context.Default.AzureCLI.DefaultOutputType\": \"unknown\", \"Context.Default.AzureCLI.EnvironmentVariables\": \"[]\", \"Context.Default.AzureCLI.Locale\": \"en_US,cp1252\", \"Context.Default.AzureCLI.StartTime\": \"2018-01-10 11:04:17.395925\", \"Context.Default.AzureCLI.EndTime\": \"2018-01-10 11:04:18.271566\", \"Context.Default.AzureCLI.OutputType\": \"tsv\", \"Context.Default.AzureCLI.Parameters\": \"--vault-name,-n,--query,-o\", \"Context.Default.AzureCLI.PythonVersion\": \"3.6.1\"}}, {\"name\": \"azurecli/commands/outer-exception\", \"properties\": {\"Reserved.DataModel.EntityType\": \"Fault\", \"Reserved.DataModel.Fault.Description\": \"Unexpected exception caught during application execution.\", \"Reserved.DataModel.Correlation.1\": \"6f619da6-dd28-4192-bdca-cede461a046c,UserTask,\", \"Reserved.DataModel.Fault.TypeString\": \"CLIError\", \"Reserved.DataModel.Fault.Exception.Message\": \"Max retries exceeded attempting to connect to vault. The vault may not exist or you may need to flush your DNS cache and try again later.\", \"Reserved.DataModel.Fault.Exception.StackTrace\": \"[_site-packages\\\\azure\\\\cli\\\\main.py_, line 36, in main\\n    cmd_result = APPLICATION.execute(args)\\n_, _site-packages\\\\azure\\\\cli\\\\core\\\\application.py_, line 212, in execute\\n    result = expanded_arg.func(params)\\n_, _site-packages\\\\azure\\\\cli\\\\core\\\\commands\\\\__init__.py_, line 377, in __call__\\n    return self.handler(*args, **kwargs)\\n_, _site-packages\\\\azure\\\\cli\\\\command_modules\\\\keyvault\\\\_command_type.py_, line 94, in _execute_command\\n    raise CLIError(\\_Max retries exceeded attempting to connect to vault. \\_\\n_]\", \"Reserved.ChannelUsed\": \"AI\", \"Reserved.EventId\": \"a275e012-488d-4f11-adc2-81616363ecef\", \"Reserved.SequenceNumber\": 1, \"Reserved.SessionId\": \"a1cee7d3-0840-4ffd-a406-4dbc10d725d7\", \"Reserved.TimeSinceSessionStart\": 0, \"Reserved.DataModel.Source\": \"DataModelAPI\", \"Reserved.DataModel.EntitySchemaVersion\": 4, \"Reserved.DataModel.Severity\": 0, \"Reserved.DataModel.ProductName\": \"azurecli\", \"Reserved.DataModel.FeatureName\": \"commands\", \"Reserved.DataModel.EntityName\": \"keyvault-secret-show\", \"Reserved.DataModel.CorrelationId\": \"4a1d649c-a77b-45b0-ab59-8a890e2ab7a1\", \"Context.Default.VS.Core.ExeName\": \"azurecli\", \"Context.Default.VS.Core.ExeVersion\": \"2.0.16@none\", \"Context.Default.VS.Core.MacAddressHash\": \"5da9c032f0f44a0c1510177db732ab61c521995612e7777d6d52385e0782de2e\", \"Context.Default.VS.Core.Machine.Id\": \"5da9c032-f0f4-4a0c-1510-177db732ab61\", \"Context.Default.VS.Core.OS.Type\": \"windows\", \"Context.Default.VS.Core.OS.Version\": \"10.0.14393\", \"Context.Default.VS.Core.User.Id\": \"6d047a0a-98c9-11e7-832e-6c4008a83ec5\", \"Context.Default.VS.Core.User.IsMicrosoftInternal\": \"False\", \"Context.Default.VS.Core.User.IsOptedIn\": \"True\", \"Context.Default.VS.Core.TelemetryApi.ProductVersion\": \"azurecli@2.0.16\", \"Context.Default.AzureCLI.Source\": \"az\", \"Context.Default.AzureCLI.ClientRequestId\": \"e9249d12-f61f-11e7-b16d-6c4008a83ec4\", \"Context.Default.AzureCLI.CoreVersion\": \"2.0.16\", \"Context.Default.AzureCLI.InstallationId\": \"6d047a0a-98c9-11e7-832e-6c4008a83ec5\", \"Context.Default.AzureCLI.ShellType\": \"cmd\", \"Context.Default.AzureCLI.UserAzureId\": \"42fb4f40fed79ba0dac131b56a0ffc9890ea8e9158cbb2ce3a156c54f8f8ec4c\", \"Context.Default.AzureCLI.UserAzureSubscriptionId\": \"00abbc18-78e7-4052-9a0f-84076b2737f3\", \"Context.Default.AzureCLI.DefaultOutputType\": \"unknown\", \"Context.Default.AzureCLI.EnvironmentVariables\": \"[]\", \"Context.Default.AzureCLI.Locale\": \"en_US,cp1252\", \"Context.Default.AzureCLI.StartTime\": \"2018-01-10 11:04:17.395925\", \"Context.Default.AzureCLI.EndTime\": \"2018-01-10 11:04:18.271566\", \"Context.Default.AzureCLI.OutputType\": \"tsv\", \"Context.Default.AzureCLI.Parameters\": \"--vault-name,-n,--query,-o\", \"Context.Default.AzureCLI.PythonVersion\": \"3.6.1\"}}]"