[nginx] Core: added a warning about reusing connections.

[Maxim Dounin]

details:   https://hg.nginx.org/nginx/rev/b9071b875194
branches:  
changeset: 7697:b9071b875194
user:      Maxim Dounin <mdounin at mdounin.ru>
date:      Mon Aug 10 18:52:59 2020 +0300
description:
Core: added a warning about reusing connections.

Previously, reusing connections happened silently and was only
visible in monitoring systems.  This was shown to be not very user-friendly,
and administrators often didn't realize there were too few connections
available to withstand the load, and configured timeouts (keepalive_timeout
and http2_idle_timeout) were effectively reduced to keep things running.

To provide at least some information about this, a warning is now logged
(at most once per second, to avoid flooding the logs).

diffstat:

 src/core/ngx_connection.c |  13 +++++++++++++
 src/core/ngx_cycle.h      |   1 +
 2 files changed, 14 insertions(+), 0 deletions(-)

diffs (34 lines):

diff -r 45764bca69b0 -r b9071b875194 src/core/ngx_connection.c
--- a/src/core/ngx_connection.c	Mon Aug 10 18:52:34 2020 +0300
+++ b/src/core/ngx_connection.c	Mon Aug 10 18:52:59 2020 +0300
@@ -1298,6 +1298,19 @@ ngx_drain_connections(ngx_cycle_t *cycle
     ngx_queue_t       *q;
     ngx_connection_t  *c;
 
+    if (cycle->reusable_connections_n == 0) {
+        return;
+    }
+
+    if (cycle->connections_reuse_time != ngx_time()) {
+        cycle->connections_reuse_time = ngx_time();
+
+        ngx_log_error(NGX_LOG_WARN, cycle->log, 0,
+                      "%ui worker_connections are not enough, "
+                      "reusing connections",
+                      cycle->connection_n);
+    }
+
     n = ngx_max(ngx_min(32, cycle->reusable_connections_n / 8), 1);
 
     for (i = 0; i < n; i++) {
diff -r 45764bca69b0 -r b9071b875194 src/core/ngx_cycle.h
--- a/src/core/ngx_cycle.h	Mon Aug 10 18:52:34 2020 +0300
+++ b/src/core/ngx_cycle.h	Mon Aug 10 18:52:59 2020 +0300
@@ -55,6 +55,7 @@ struct ngx_cycle_s {
 
     ngx_queue_t               reusable_connections_queue;
     ngx_uint_t                reusable_connections_n;
+    time_t                    connections_reuse_time;
 
     ngx_array_t               listening;
     ngx_array_t               paths;