Details
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Improvement
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Resolution: Fixed
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Major - P3
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None
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None
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Fully Compatible
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Service Arch 2022-07-25, Service Arch 2022-08-08, Service Arch 2022-08-22, Service Arch 2022-09-05, Service Arch 2022-09-19, Service Arch 2022-10-03
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3
Description
This ticket concerns connections incoming to a mongos or mongod – we call the incoming connection path the ingress layer. Before the ingress layer accepts a connection, this connection sits in the accept queue on the TCP layer.
The accept queue has a fixed size, and when the queue is full, the OS will start dropping incoming connections at the pre-mongo level. An overflowing queue means that either a mongo process is not accepting connections fast enough, or that the kernel is throttling connection establishment.
Of particular note are generic TCP metrics TcpExtListenOverflows and TcpExtListenDrops.
Attachments
Issue Links
- is documented by
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DOCS-15844 Investigate changes in SERVER-64005: Add metric to track the 'fullness' of the TCP accept queue
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- Closed
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