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Server Compat:
- 4.3
Driver Changes:
Not Needed
Upstream Changes Summary:
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This change enables "TCP Fast Open" (TFO) connections to MongoDB.

The operating system of both the client and server must have TFO support

Windows: Server only on Windows 10 or later

macOS: Server only on 10.11 or later

Linux

Client: Kernel version >= 4.11, /proc/sys/net/ipv4/tcp_fastopen set to 1 or 3.

Server: Kernel version >= 3.7, /proc/sys/net/ipv4/tcp_fastopen set to 2 or 3

setParameters (these are enabled by default):

tcpFastOpenClient - Attempt to make outbound TFO connections

tcpFastOpenServer - Accept inbound TFO connection attempts

Additionally the following setParameter may be tuned on the server:

tcpFastOpenQueueSize (default 1024).
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This change enables "TCP Fast Open" (TFO) connections to MongoDB. The operating system of both the client and server must have TFO support Windows: Server only on Windows 10 or later macOS: Server only on 10.11 or later Linux Client: Kernel version >= 4.11, /proc/sys/net/ipv4/tcp_fastopen set to 1 or 3. Server: Kernel version >= 3.7, /proc/sys/net/ipv4/tcp_fastopen set to 2 or 3 setParameters (these are enabled by default): tcpFastOpenClient - Attempt to make outbound TFO connections tcpFastOpenServer - Accept inbound TFO connection attempts Additionally the following setParameter may be tuned on the server: tcpFastOpenQueueSize (default 1024).

Downstream Change Summary

This change enables "TCP Fast Open" (TFO) connections to MongoDB.

setParameters (these are enabled by default):

Additionally the following setParameter may be tuned on the server:

Description of Linked Ticket

We should investigate what work needs to be done to perform TCP Fast Open when speaking to other hosts.

depends on

SERVER-44676 TCP Fast Open