Research the reason why sometimes the initial heatbeat can take more than 5 seconds

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    • Type: Task
    • Resolution: Gone away
    • Priority: Major - P3
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    • Affects Version/s: None
    • Component/s: Testing
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      1. What would you like to communicate to the user about this feature?
      2. Would you like the user to see examples of the syntax and/or executable code and its output?
      3. Which versions of the driver/connector does this apply to?

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      1. What would you like to communicate to the user about this feature? 2. Would you like the user to see examples of the syntax and/or executable code and its output? 3. Which versions of the driver/connector does this apply to?
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      This is a follow-up ticket for CSHARP-2964.

      Calling this line may require approximately around 5 seconds: https://github.com/mongodb/mongo-csharp-driver/blob/master/src/MongoDB.Driver.Core/Core/Connections/TcpStreamFactory.cs#L311 

      I've added a log to 310 and 315 lines:

      "await await Dns.GetHostAddressesAsync":
{ 
     "Message": "await Dns.GetHostAddressesAsync", 
     "Endpoint": "Unspecified/localhost:27017", 
     "Cancelled": "Cancelled_null", 
     "Date": "07/23/20 1:48:54_596", 
     "AppName": "TestSocketConfigurator" 
},
"socket_created":
{
     "Message": "socket_creating", 
     "Endpoint": "Unspecified/localhost:27017", 
     "Cancelled": "Cancelled_null", 
     "Date": "07/23/20 1:48:59_587", 
     "AppName": "TestSocketConfigurator" 
}

      Pay attention to the difference between `Date`s. We need to investigate the reasons for this behavior. The EG: https://evergreen.mongodb.com/task_log_raw/dot_net_driver_tests_snappy_compression__version~4.4_os~windows_64_topology~standalone_auth~noauth_ssl~nossl_compressor~snappy_test_netstandard15_patch_297fcd723ff32aac47b7b018c978ec4baf0773d7_5f18e7f0c9ec445ac9df0b6a_20_07_23_01_29_20/0?type=T#L2989

            Assignee:
            Boris Dogadov
            Reporter:
            Dmitry Lukyanov (Inactive)
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              Created:
              Updated:
              Resolved: