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backup upstream servers

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This commit is contained in:
Igor Sysoev 2007-08-09 13:54:33 +00:00
parent c5245bab92
commit 73d67a9729
4 changed files with 137 additions and 18 deletions
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17
src/http/ngx_http_upstream.c
View file

@ -565,9 +565,11 @@ ngx_http_upstream_connect(ngx_http_request_t *r, ngx_http_upstream_t *u)
if (rc == NGX_BUSY) {
ngx_log_error(NGX_LOG_ERR, r->connection->log, 0, "no live upstreams");
ngx_http_upstream_next(r, u, NGX_HTTP_UPSTREAM_FT_NOLIVE);
return;
}
if (rc == NGX_BUSY || rc == NGX_DECLINED) {
if (rc == NGX_DECLINED) {
ngx_http_upstream_next(r, u, NGX_HTTP_UPSTREAM_FT_ERROR);
return;
}
@ -2153,7 +2155,9 @@ ngx_http_upstream_next(ngx_http_request_t *r, ngx_http_upstream_t *u,
state = NGX_PEER_FAILED;
}
if (ft_type != NGX_HTTP_UPSTREAM_FT_NOLIVE) {
u->peer.free(&u->peer, u->peer.data, state);
}
if (ft_type == NGX_HTTP_UPSTREAM_FT_TIMEOUT) {
ngx_log_error(NGX_LOG_ERR, r->connection->log, NGX_ETIMEDOUT,
@ -3118,6 +3122,17 @@ ngx_http_upstream_server(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
continue;
}
if (ngx_strncmp(value[i].data, "backup", 6) == 0) {
if (!(uscf->flags & NGX_HTTP_UPSTREAM_BACKUP)) {
goto invalid;
}
us->backup = 1;
continue;
}
if (ngx_strncmp(value[i].data, "down", 4) == 0) {
if (!(uscf->flags & NGX_HTTP_UPSTREAM_DOWN)) {

1
src/http/ngx_http_upstream.h
View file

@ -24,6 +24,7 @@
#define NGX_HTTP_UPSTREAM_FT_HTTP_404 0x00000040
#define NGX_HTTP_UPSTREAM_FT_BUSY_LOCK 0x00000080
#define NGX_HTTP_UPSTREAM_FT_MAX_WAITING 0x00000100
#define NGX_HTTP_UPSTREAM_FT_NOLIVE 0x40000000
#define NGX_HTTP_UPSTREAM_FT_OFF 0x80000000

116
src/http/ngx_http_upstream_round_robin.c
View file

@ -20,15 +20,20 @@ ngx_http_upstream_init_round_robin(ngx_conf_t *cf,
ngx_url_t u;
ngx_uint_t i, j, n;
ngx_http_upstream_server_t *server;
ngx_http_upstream_rr_peers_t *peers;
ngx_http_upstream_rr_peers_t *peers, *backup;
us->peer.init = ngx_http_upstream_init_round_robin_peer;
if (us->servers) {
n = 0;
server = us->servers->elts;
n = 0;
for (i = 0; i < us->servers->nelts; i++) {
if (server[i].backup) {
continue;
}
n += server[i].naddrs;
}
@ -38,6 +43,7 @@ ngx_http_upstream_init_round_robin(ngx_conf_t *cf,
return NGX_ERROR;
}
peers->single = (n == 1);
peers->number = n;
peers->name = &us->host;
@ -45,6 +51,10 @@ ngx_http_upstream_init_round_robin(ngx_conf_t *cf,
for (i = 0; i < us->servers->nelts; i++) {
for (j = 0; j < server[i].naddrs; j++) {
if (server[i].backup) {
continue;
}
peers->peer[n].sockaddr = server[i].addrs[j].sockaddr;
peers->peer[n].socklen = server[i].addrs[j].socklen;
peers->peer[n].name = server[i].addrs[j].name;
@ -59,6 +69,55 @@ ngx_http_upstream_init_round_robin(ngx_conf_t *cf,
us->peer.data = peers;
/* backup servers */
n = 0;
for (i = 0; i < us->servers->nelts; i++) {
if (!server[i].backup) {
continue;
}
n += server[i].naddrs;
}
if (n == 0) {
return NGX_OK;
}
backup = ngx_pcalloc(cf->pool, sizeof(ngx_http_upstream_rr_peers_t)
+ sizeof(ngx_http_upstream_rr_peer_t) * (n - 1));
if (backup == NULL) {
return NGX_ERROR;
}
peers->single = 0;
backup->single = 0;
backup->number = n;
backup->name = &us->host;
n = 0;
for (i = 0; i < us->servers->nelts; i++) {
for (j = 0; j < server[i].naddrs; j++) {
if (!server[i].backup) {
continue;
}
backup->peer[n].sockaddr = server[i].addrs[j].sockaddr;
backup->peer[n].socklen = server[i].addrs[j].socklen;
backup->peer[n].name = server[i].addrs[j].name;
backup->peer[n].weight = server[i].weight;
backup->peer[n].current_weight = server[i].weight;
backup->peer[n].max_fails = server[i].max_fails;
backup->peer[n].fail_timeout = server[i].fail_timeout;
backup->peer[n].down = server[i].down;
n++;
}
}
peers->next = backup;
return NGX_OK;
}
@ -95,6 +154,7 @@ ngx_http_upstream_init_round_robin(ngx_conf_t *cf,
return NGX_ERROR;
}
peers->single = (n == 1);
peers->number = n;
peers->name = &us->host;
@ -113,6 +173,8 @@ ngx_http_upstream_init_round_robin(ngx_conf_t *cf,
us->peer.data = peers;
/* implicitly defined upstream has no backup servers */
return NGX_OK;
}
@ -173,9 +235,11 @@ ngx_http_upstream_get_round_robin_peer(ngx_peer_connection_t *pc, void *data)
time_t now;
uintptr_t m;
ngx_int_t rc;
ngx_uint_t i, n;
ngx_connection_t *c;
ngx_http_upstream_rr_peer_t *peer;
ngx_http_upstream_rr_peers_t *peers;
ngx_log_debug1(NGX_LOG_DEBUG_HTTP, pc->log, 0,
"get rr peer, try: %ui", pc->tries);
@ -207,7 +271,7 @@ ngx_http_upstream_get_round_robin_peer(ngx_peer_connection_t *pc, void *data)
pc->cached = 0;
pc->connection = NULL;
if (rrp->peers->number == 1) {
if (rrp->peers->single) {
peer = &rrp->peers->peer[0];
} else {
@ -319,19 +383,53 @@ ngx_http_upstream_get_round_robin_peer(ngx_peer_connection_t *pc, void *data)
/* ngx_unlock_mutex(rrp->peers->mutex); */
if (pc->tries == 1 && rrp->peers->next) {
pc->tries += rrp->peers->next->number;
n = rrp->peers->next->number / (8 * sizeof(uintptr_t)) + 1;
for (i = 0; i < n; n++) {
rrp->tried[i] = 0;
}
}
return NGX_OK;
failed:
/* all peers failed, mark them as live for quick recovery */
peers = rrp->peers;
for (i = 0; i < rrp->peers->number; i++) {
rrp->peers->peer[i].fails = 0;
if (peers->next) {
/* ngx_unlock_mutex(peers->mutex); */
ngx_log_debug0(NGX_LOG_DEBUG_HTTP, pc->log, 0, "backup servers");
rrp->peers = peers->next;
pc->tries = rrp->peers->number;
n = rrp->peers->number / (8 * sizeof(uintptr_t)) + 1;
for (i = 0; i < n; n++) {
rrp->tried[i] = 0;
}
/* ngx_unlock_mutex(rrp->peers->mutex); */
rc = ngx_http_upstream_get_round_robin_peer(pc, rrp);
pc->name = rrp->peers->name;
if (rc != NGX_BUSY) {
return rc;
}
/* ngx_lock_mutex(peers->mutex); */
}
/* all peers failed, mark them as live for quick recovery */
for (i = 0; i < peers->number; i++) {
peers->peer[i].fails = 0;
}
/* ngx_unlock_mutex(peers->mutex); */
pc->name = peers->name;
return NGX_BUSY;
}
@ -410,7 +508,7 @@ ngx_http_upstream_free_round_robin_peer(ngx_peer_connection_t *pc, void *data,
/* TODO: NGX_PEER_KEEPALIVE */
if (rrp->peers->number == 1) {
if (rrp->peers->single) {
pc->tries = 0;
return;
}

9
src/http/ngx_http_upstream_round_robin.h
View file

@ -35,7 +35,10 @@ typedef struct {
} ngx_http_upstream_rr_peer_t;
typedef struct {
typedef struct ngx_http_upstream_rr_peers_s ngx_http_upstream_rr_peers_t;
struct ngx_http_upstream_rr_peers_s {
ngx_uint_t single; /* unsigned single:1; */
ngx_uint_t number;
ngx_uint_t last_cached;
@ -44,8 +47,10 @@ typedef struct {
ngx_str_t *name;
ngx_http_upstream_rr_peers_t *next;
ngx_http_upstream_rr_peer_t peer[1];
} ngx_http_upstream_rr_peers_t;
};
typedef struct {