SocketStream configures jdk.net.ExtendedSocketOptions.TCP_KEEPIDLE/TCP_KEEPCOUNT/TCP_KEEPINTERVAL in addition to enabling the TCP keep-alive mechanism.

• It looks like AsynchronousSocketChannelStream, TlsChannelStream can trivially do the same.
• NettyStream can do the same, though not as straightforward. There is:
  • NioChannelOption.of, which can be used to specify jdk.net.ExtendedSocketOptions.TCP_KEEPIDLE/TCP_KEEPCOUNT/TCP_KEEPINTERVAL when NioSocketChannel is used.
  • EpollChannelOption.TCP_KEEPIDLE/TCP_KEEPCNT/TCP_KEEPINTVL, which can be used when EpollSocketChannel is used.
  • IoUringChannelOption.TCP_KEEPIDLE/TCP_KEEPCNT/TCP_KEEPINTVL, which can be used when IoUringSocketChannel is used.

Note that applications may configure the SocketChannel used by Netty via com.mongodb.connection.NettyTransportSettings.Builder.socketChannelClass.

For additional info see

• https://jira.mongodb.org/browse/HELP-89960?focusedCommentId=8185838&focusedId=8185838&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-8185838
• DRIVERS-383
• https://www.kovalenko.link/blog/tcp-keep-alive