Upstream keepalive: keepalive_requests directive.
The directive configures maximum number of requests allowed on
a connection kept in the cache. Once a connection reaches the number
of requests configured, it is no longer saved to the cache.
The default is 100.
Much like keepalive_requests for client connections, this is mostly
a safeguard to make sure connections are closed periodically and the
memory allocated from the connection pool is freed.
diff --git a/src/http/modules/ngx_http_upstream_keepalive_module.c b/src/http/modules/ngx_http_upstream_keepalive_module.c
index ffb2bcf..bdc4ae5 100644
--- a/src/http/modules/ngx_http_upstream_keepalive_module.c
+++ b/src/http/modules/ngx_http_upstream_keepalive_module.c
@@ -12,6 +12,7 @@
typedef struct {
ngx_uint_t max_cached;
+ ngx_uint_t requests;
ngx_msec_t timeout;
ngx_queue_t cache;
@@ -92,6 +93,13 @@
offsetof(ngx_http_upstream_keepalive_srv_conf_t, timeout),
NULL },
+ { ngx_string("keepalive_requests"),
+ NGX_HTTP_UPS_CONF|NGX_CONF_TAKE1,
+ ngx_conf_set_num_slot,
+ NGX_HTTP_SRV_CONF_OFFSET,
+ offsetof(ngx_http_upstream_keepalive_srv_conf_t, requests),
+ NULL },
+
ngx_null_command
};
@@ -142,6 +150,7 @@
ngx_http_upstream_keepalive_module);
ngx_conf_init_msec_value(kcf->timeout, 60000);
+ ngx_conf_init_uint_value(kcf->requests, 100);
if (kcf->original_init_upstream(cf, us) != NGX_OK) {
return NGX_ERROR;
@@ -312,6 +321,10 @@
goto invalid;
}
+ if (c->requests >= kp->conf->requests) {
+ goto invalid;
+ }
+
if (!u->keepalive) {
goto invalid;
}
@@ -500,6 +513,7 @@
*/
conf->timeout = NGX_CONF_UNSET_MSEC;
+ conf->requests = NGX_CONF_UNSET_UINT;
return conf;
}
diff --git a/src/http/ngx_http_upstream.c b/src/http/ngx_http_upstream.c
index 63fa5d9..605ae34 100644
--- a/src/http/ngx_http_upstream.c
+++ b/src/http/ngx_http_upstream.c
@@ -1546,6 +1546,8 @@
c = u->peer.connection;
+ c->requests++;
+
c->data = r;
c->write->handler = ngx_http_upstream_handler;