commit 6c02274ce275615fbbc83703b6f695a0a53c87f1
author Alexey Serbin <alexey@apache.org> Thu Dec 14 10:36:31 2023 -0800
committer Alexey Serbin <alexey@apache.org> Sat Dec 16 04:01:52 2023 +0000
tree 0e12481bc403bf230576c375c1eb4709dab8395e
parent 8bc0be58ef0a02f33d2ecd71cfe721fd16db1730

[rpc] increase listened socket backlog up to 512

This patch updates the default value for --rpc_acceptor_listen_backlog,
setting it up to 512 by default.  This is to help busy Kudu servers
accommodating of larger bursts of incoming requests for new RPC
connections.  In addition, a warning message is output into the log
if the setting for the flag is effectively capped by the system-level
limit.

I manually verified that the warning is issued as expected on Linux and
macOS, correspondingly:

  --rpc_acceptor_listen_backlog setting 512 is capped at 128 by /proc/sys/net/core/somaxconn

  --rpc_acceptor_listen_backlog setting 512 is capped at 256 by kern.ipc.somaxconn

Change-Id: Ib6f5791acad6ea0787e23d4c71ab2a7ac4c8c1f2
Reviewed-on: http://gerrit.cloudera.org:8080/20797
Tested-by: Kudu Jenkins
Reviewed-by: Abhishek Chennaka <achennaka@cloudera.com>