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Upstream: track the number of active connections to upstreams.

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This also simplifies the implementation of the least_conn module.
This commit is contained in:
Ruslan Ermilov 2015-04-10 13:16:23 +03:00
parent b25f0ddcf1
commit 18fa775b10
5 changed files with 35 additions and 122 deletions
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4
src/http/modules/ngx_http_upstream_hash_module.c
View File

@ -262,6 +262,8 @@ ngx_http_upstream_get_hash_peer(ngx_peer_connection_t *pc, void *data)
pc->socklen = peer->socklen;
pc->name = &peer->name;
peer->conns++;
if (now - peer->checked > peer->fail_timeout) {
peer->checked = now;
}
@ -562,6 +564,8 @@ ngx_http_upstream_get_chash_peer(ngx_peer_connection_t *pc, void *data)
pc->socklen = best->socklen;
pc->name = &best->name;
best->conns++;
return NGX_OK;
}

2
src/http/modules/ngx_http_upstream_ip_hash_module.c
View File

@ -242,6 +242,8 @@ ngx_http_upstream_get_ip_hash_peer(ngx_peer_connection_t *pc, void *data)
pc->socklen = peer->socklen;
pc->name = &peer->name;
peer->conns++;
if (now - peer->checked > peer->fail_timeout) {
peer->checked = now;
}

138
src/http/modules/ngx_http_upstream_least_conn_module.c
View File

@ -10,29 +10,10 @@
#include <ngx_http.h>
typedef struct {
ngx_uint_t *conns;
} ngx_http_upstream_least_conn_conf_t;
typedef struct {
/* the round robin data must be first */
ngx_http_upstream_rr_peer_data_t rrp;
ngx_uint_t *conns;
ngx_event_get_peer_pt get_rr_peer;
ngx_event_free_peer_pt free_rr_peer;
} ngx_http_upstream_lc_peer_data_t;
static ngx_int_t ngx_http_upstream_init_least_conn_peer(ngx_http_request_t *r,
ngx_http_upstream_srv_conf_t *us);
static ngx_int_t ngx_http_upstream_get_least_conn_peer(
ngx_peer_connection_t *pc, void *data);
static void ngx_http_upstream_free_least_conn_peer(ngx_peer_connection_t *pc,
void *data, ngx_uint_t state);
static void *ngx_http_upstream_least_conn_create_conf(ngx_conf_t *cf);
static char *ngx_http_upstream_least_conn(ngx_conf_t *cf, ngx_command_t *cmd,
void *conf);
@ -57,7 +38,7 @@ static ngx_http_module_t ngx_http_upstream_least_conn_module_ctx = {
NULL, /* create main configuration */
NULL, /* init main configuration */
ngx_http_upstream_least_conn_create_conf, /* create server configuration */
NULL, /* create server configuration */
NULL, /* merge server configuration */
NULL, /* create location configuration */
@ -85,10 +66,6 @@ static ngx_int_t
ngx_http_upstream_init_least_conn(ngx_conf_t *cf,
ngx_http_upstream_srv_conf_t *us)
{
ngx_uint_t n;
ngx_http_upstream_rr_peers_t *peers;
ngx_http_upstream_least_conn_conf_t *lcf;
ngx_log_debug0(NGX_LOG_DEBUG_HTTP, cf->log, 0,
"init least conn");
@ -96,22 +73,6 @@ ngx_http_upstream_init_least_conn(ngx_conf_t *cf,
return NGX_ERROR;
}
peers = us->peer.data;
n = peers->number;
if (peers->next) {
n += peers->next->number;
}
lcf = ngx_http_conf_upstream_srv_conf(us,
ngx_http_upstream_least_conn_module);
lcf->conns = ngx_pcalloc(cf->pool, sizeof(ngx_uint_t) * n);
if (lcf->conns == NULL) {
return NGX_ERROR;
}
us->peer.init = ngx_http_upstream_init_least_conn_peer;
return NGX_OK;
@ -122,33 +83,14 @@ static ngx_int_t
ngx_http_upstream_init_least_conn_peer(ngx_http_request_t *r,
ngx_http_upstream_srv_conf_t *us)
{
ngx_http_upstream_lc_peer_data_t *lcp;
ngx_http_upstream_least_conn_conf_t *lcf;
ngx_log_debug0(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
"init least conn peer");
lcf = ngx_http_conf_upstream_srv_conf(us,
ngx_http_upstream_least_conn_module);
lcp = ngx_palloc(r->pool, sizeof(ngx_http_upstream_lc_peer_data_t));
if (lcp == NULL) {
return NGX_ERROR;
}
lcp->conns = lcf->conns;
r->upstream->peer.data = &lcp->rrp;
if (ngx_http_upstream_init_round_robin_peer(r, us) != NGX_OK) {
return NGX_ERROR;
}
r->upstream->peer.get = ngx_http_upstream_get_least_conn_peer;
r->upstream->peer.free = ngx_http_upstream_free_least_conn_peer;
lcp->get_rr_peer = ngx_http_upstream_get_round_robin_peer;
lcp->free_rr_peer = ngx_http_upstream_free_round_robin_peer;
return NGX_OK;
}
@ -157,7 +99,7 @@ ngx_http_upstream_init_least_conn_peer(ngx_http_request_t *r,
static ngx_int_t
ngx_http_upstream_get_least_conn_peer(ngx_peer_connection_t *pc, void *data)
{
ngx_http_upstream_lc_peer_data_t *lcp = data;
ngx_http_upstream_rr_peer_data_t *rrp = data;
time_t now;
uintptr_t m;
@ -169,8 +111,8 @@ ngx_http_upstream_get_least_conn_peer(ngx_peer_connection_t *pc, void *data)
ngx_log_debug1(NGX_LOG_DEBUG_HTTP, pc->log, 0,
"get least conn peer, try: %ui", pc->tries);
if (lcp->rrp.peers->single) {
return lcp->get_rr_peer(pc, &lcp->rrp);
if (rrp->peers->single) {
return ngx_http_upstream_get_round_robin_peer(pc, rrp);
}
pc->cached = 0;
@ -178,7 +120,7 @@ ngx_http_upstream_get_least_conn_peer(ngx_peer_connection_t *pc, void *data)
now = ngx_time();
peers = lcp->rrp.peers;
peers = rrp->peers;
best = NULL;
total = 0;
@ -193,7 +135,7 @@ ngx_http_upstream_get_least_conn_peer(ngx_peer_connection_t *pc, void *data)
n = i / (8 * sizeof(uintptr_t));
m = (uintptr_t) 1 << i % (8 * sizeof(uintptr_t));
if (lcp->rrp.tried[n] & m) {
if (rrp->tried[n] & m) {
continue;
}
@ -217,15 +159,13 @@ ngx_http_upstream_get_least_conn_peer(ngx_peer_connection_t *pc, void *data)
*/
if (best == NULL
|| lcp->conns[i] * best->weight < lcp->conns[p] * peer->weight)
|| peer->conns * best->weight < best->conns * peer->weight)
{
best = peer;
many = 0;
p = i;
} else if (lcp->conns[i] * best->weight
== lcp->conns[p] * peer->weight)
{
} else if (peer->conns * best->weight == best->conns * peer->weight) {
many = 1;
}
}
@ -246,7 +186,7 @@ ngx_http_upstream_get_least_conn_peer(ngx_peer_connection_t *pc, void *data)
n = i / (8 * sizeof(uintptr_t));
m = (uintptr_t) 1 << i % (8 * sizeof(uintptr_t));
if (lcp->rrp.tried[n] & m) {
if (rrp->tried[n] & m) {
continue;
}
@ -256,7 +196,7 @@ ngx_http_upstream_get_least_conn_peer(ngx_peer_connection_t *pc, void *data)
continue;
}
if (lcp->conns[i] * best->weight != lcp->conns[p] * peer->weight) {
if (peer->conns * best->weight != best->conns * peer->weight) {
continue;
}
@ -291,13 +231,14 @@ ngx_http_upstream_get_least_conn_peer(ngx_peer_connection_t *pc, void *data)
pc->socklen = best->socklen;
pc->name = &best->name;
lcp->rrp.current = p;
best->conns++;
rrp->current = p;
n = p / (8 * sizeof(uintptr_t));
m = (uintptr_t) 1 << p % (8 * sizeof(uintptr_t));
lcp->rrp.tried[n] |= m;
lcp->conns[p]++;
rrp->tried[n] |= m;
return NGX_OK;
@ -307,18 +248,16 @@ failed:
ngx_log_debug0(NGX_LOG_DEBUG_HTTP, pc->log, 0,
"get least conn peer, backup servers");
lcp->conns += peers->number;
rrp->peers = peers->next;
lcp->rrp.peers = peers->next;
n = (lcp->rrp.peers->number + (8 * sizeof(uintptr_t) - 1))
n = (rrp->peers->number + (8 * sizeof(uintptr_t) - 1))
/ (8 * sizeof(uintptr_t));
for (i = 0; i < n; i++) {
lcp->rrp.tried[i] = 0;
rrp->tried[i] = 0;
}
rc = ngx_http_upstream_get_least_conn_peer(pc, lcp);
rc = ngx_http_upstream_get_least_conn_peer(pc, rrp);
if (rc != NGX_BUSY) {
return rc;
@ -337,47 +276,6 @@ failed:
}
static void
ngx_http_upstream_free_least_conn_peer(ngx_peer_connection_t *pc,
void *data, ngx_uint_t state)
{
ngx_http_upstream_lc_peer_data_t *lcp = data;
ngx_log_debug2(NGX_LOG_DEBUG_HTTP, pc->log, 0,
"free least conn peer %ui %ui", pc->tries, state);
if (lcp->rrp.peers->single) {
lcp->free_rr_peer(pc, &lcp->rrp, state);
return;
}
lcp->conns[lcp->rrp.current]--;
lcp->free_rr_peer(pc, &lcp->rrp, state);
}
static void *
ngx_http_upstream_least_conn_create_conf(ngx_conf_t *cf)
{
ngx_http_upstream_least_conn_conf_t *conf;
conf = ngx_pcalloc(cf->pool,
sizeof(ngx_http_upstream_least_conn_conf_t));
if (conf == NULL) {
return NULL;
}
/*
* set by ngx_pcalloc():
*
* conf->conns = NULL;
*/
return conf;
}
static char *
ngx_http_upstream_least_conn(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
{

11
src/http/ngx_http_upstream_round_robin.c
View File

@ -434,6 +434,8 @@ ngx_http_upstream_get_round_robin_peer(ngx_peer_connection_t *pc, void *data)
pc->socklen = peer->socklen;
pc->name = &peer->name;
peer->conns++;
/* ngx_unlock_mutex(peers->mutex); */
return NGX_OK;
@ -563,13 +565,16 @@ ngx_http_upstream_free_round_robin_peer(ngx_peer_connection_t *pc, void *data,
/* TODO: NGX_PEER_KEEPALIVE */
peer = &rrp->peers->peer[rrp->current];
if (rrp->peers->single) {
peer->conns--;
pc->tries = 0;
return;
}
peer = &rrp->peers->peer[rrp->current];
if (state & NGX_PEER_FAILED) {
now = ngx_time();
@ -602,6 +607,8 @@ ngx_http_upstream_free_round_robin_peer(ngx_peer_connection_t *pc, void *data,
}
}
peer->conns--;
if (pc->tries) {
pc->tries--;
}

2
src/http/ngx_http_upstream_round_robin.h
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@ -24,6 +24,8 @@ typedef struct {
ngx_int_t effective_weight;
ngx_int_t weight;
ngx_uint_t conns;
ngx_uint_t fails;
time_t accessed;
time_t checked;