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Type:
Improvement
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Resolution: Duplicate
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Priority:
Major - P3
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None
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Affects Version/s: 4.0.9
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Component/s: None
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Service Arch 2019-05-06, Service Arch 2019-05-20, Service Arch 2019-07-15
Currently, when a server closes connections, it sometimes provides a reason why it does that, and sometimes does not.
SERVER-39941 provides an example when the server does indicate the reason for closing a connection:
2019-03-04T13:07:11.146-0500 E NETWORK [conn129] no SSL certificate provided by peer; connection rejected 2019-03-04T13:07:11.146-0500 I NETWORK [conn129] Error receiving request from client: SSLHandshakeFailed: no SSL certificate provided by peer; connection rejected. Ending connection from 127.0.0.1:48388 (connection id: 129)
SERVER-40556 provides an example when the server does not indicate the reason:
2019-04-09T20:55:09.182-0400 I NETWORK [listener] connection accepted from 113.55.127.140:3456 #3015 (1 connection now open)
2019-04-09T20:55:09.182-0400 I NETWORK [conn3015] received client metadata from 113.55.127.140:3456 conn3015: { application: { name: "MongoDB Shell" }, driver: { name: "MongoDB Internal Client", version: "4.0.8" }, os: { type: "Windows", name: "Microsoft Windows 10", architecture: "x86_64", version: "10.0 (build 17763)" } }
2019-04-09T20:55:09.184-0400 I NETWORK [conn3015] end connection 113.55.127.140:3456 (0 connections now open)
In cases like RUBY-1713, connections are being closed when the driver does not expect this leading to the driver marking the server unknown (per SDAM specifications), which ultimately can cause application unavailability. Troubleshooting these cases is currently difficult because the server side does not indicate whether a connection close was initiated by the server, and if so for what reason, vs the server closing a connection on which a network error occurred, for example.
- duplicates
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- Closed
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- related to
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SERVER-40556 Error: error doing query: failed: network error while attempting to run command 'buildinfo'
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- Closed
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RUBY-1713 Topology flapping under load with aggressive server_selection_timeout
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- Closed
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