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  1. Core Server
  2. SERVER-64005

Add metric to track the 'fullness' of the TCP accept queue

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Details

    • Icon: Improvement Improvement
    • Resolution: Fixed
    • Icon: Major - P3 Major - P3
    • 6.2.0-rc0
    • None
    • None
    • Fully Compatible
    • 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
    • 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.

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            blake.oler@mongodb.com Blake Oler
            blake.oler@mongodb.com Blake Oler
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