Mercurial > hg > nginx
annotate src/http/ngx_http_upstream_round_robin.c @ 4991:a384c60d55f3
Upstream: fixed state resetting when switching to backup servers.
Based on patch by Thomas Chen (ticket #257).
| author | Valentin Bartenev <vbart@nginx.com> |
|---|---|
| date | Tue, 25 Dec 2012 08:02:21 +0000 |
| parents | dcb853acae97 |
| children | c9059bd5445b |
| rev | line source |
|---|---|
| 884 | 1 |
| 2 /* | |
| 3 * Copyright (C) Igor Sysoev | |
| 4412 | 4 * Copyright (C) Nginx, Inc. |
| 884 | 5 */ |
| 6 | |
| 7 | |
| 8 #include <ngx_config.h> | |
| 9 #include <ngx_core.h> | |
| 10 #include <ngx_http.h> | |
| 11 | |
| 12 | |
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13 static ngx_int_t ngx_http_upstream_cmp_servers(const void *one, |
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14 const void *two); |
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15 static ngx_http_upstream_rr_peer_t *ngx_http_upstream_get_peer( |
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16 ngx_http_upstream_rr_peer_data_t *rrp); |
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17 |
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18 #if (NGX_HTTP_SSL) |
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19 |
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20 static ngx_int_t ngx_http_upstream_empty_set_session(ngx_peer_connection_t *pc, |
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21 void *data); |
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22 static void ngx_http_upstream_empty_save_session(ngx_peer_connection_t *pc, |
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23 void *data); |
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24 |
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25 #endif |
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26 |
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27 |
| 884 | 28 ngx_int_t |
| 29 ngx_http_upstream_init_round_robin(ngx_conf_t *cf, | |
| 30 ngx_http_upstream_srv_conf_t *us) | |
| 31 { | |
| 32 ngx_url_t u; | |
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33 ngx_uint_t i, j, n, w; |
| 884 | 34 ngx_http_upstream_server_t *server; |
| 1378 | 35 ngx_http_upstream_rr_peers_t *peers, *backup; |
| 884 | 36 |
| 37 us->peer.init = ngx_http_upstream_init_round_robin_peer; | |
| 38 | |
| 39 if (us->servers) { | |
| 40 server = us->servers->elts; | |
| 41 | |
| 1378 | 42 n = 0; |
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43 w = 0; |
| 1378 | 44 |
| 884 | 45 for (i = 0; i < us->servers->nelts; i++) { |
| 1378 | 46 if (server[i].backup) { |
| 47 continue; | |
| 48 } | |
| 49 | |
| 884 | 50 n += server[i].naddrs; |
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51 w += server[i].naddrs * server[i].weight; |
| 884 | 52 } |
| 53 | |
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54 if (n == 0) { |
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55 ngx_log_error(NGX_LOG_EMERG, cf->log, 0, |
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56 "no servers in upstream \"%V\" in %s:%ui", |
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57 &us->host, us->file_name, us->line); |
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58 return NGX_ERROR; |
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59 } |
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60 |
| 884 | 61 peers = ngx_pcalloc(cf->pool, sizeof(ngx_http_upstream_rr_peers_t) |
| 62 + sizeof(ngx_http_upstream_rr_peer_t) * (n - 1)); | |
| 63 if (peers == NULL) { | |
| 64 return NGX_ERROR; | |
| 65 } | |
| 66 | |
| 1378 | 67 peers->single = (n == 1); |
| 884 | 68 peers->number = n; |
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69 peers->weighted = (w != n); |
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70 peers->total_weight = w; |
| 884 | 71 peers->name = &us->host; |
| 72 | |
| 73 n = 0; | |
| 74 | |
| 75 for (i = 0; i < us->servers->nelts; i++) { | |
| 76 for (j = 0; j < server[i].naddrs; j++) { | |
| 1378 | 77 if (server[i].backup) { |
| 78 continue; | |
| 79 } | |
| 80 | |
| 884 | 81 peers->peer[n].sockaddr = server[i].addrs[j].sockaddr; |
| 82 peers->peer[n].socklen = server[i].addrs[j].socklen; | |
| 83 peers->peer[n].name = server[i].addrs[j].name; | |
| 84 peers->peer[n].max_fails = server[i].max_fails; | |
| 85 peers->peer[n].fail_timeout = server[i].fail_timeout; | |
| 86 peers->peer[n].down = server[i].down; | |
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87 peers->peer[n].weight = server[i].weight; |
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88 peers->peer[n].effective_weight = server[i].weight; |
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89 peers->peer[n].current_weight = 0; |
| 884 | 90 n++; |
| 91 } | |
| 92 } | |
| 93 | |
| 94 us->peer.data = peers; | |
| 95 | |
| 1379 | 96 ngx_sort(&peers->peer[0], (size_t) n, |
| 97 sizeof(ngx_http_upstream_rr_peer_t), | |
| 98 ngx_http_upstream_cmp_servers); | |
| 99 | |
| 1378 | 100 /* backup servers */ |
| 101 | |
| 102 n = 0; | |
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103 w = 0; |
| 1378 | 104 |
| 105 for (i = 0; i < us->servers->nelts; i++) { | |
| 106 if (!server[i].backup) { | |
| 107 continue; | |
| 108 } | |
| 109 | |
| 110 n += server[i].naddrs; | |
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111 w += server[i].naddrs * server[i].weight; |
| 1378 | 112 } |
| 113 | |
| 114 if (n == 0) { | |
| 115 return NGX_OK; | |
| 116 } | |
| 117 | |
| 118 backup = ngx_pcalloc(cf->pool, sizeof(ngx_http_upstream_rr_peers_t) | |
| 119 + sizeof(ngx_http_upstream_rr_peer_t) * (n - 1)); | |
| 120 if (backup == NULL) { | |
| 121 return NGX_ERROR; | |
| 122 } | |
| 123 | |
| 124 peers->single = 0; | |
| 125 backup->single = 0; | |
| 126 backup->number = n; | |
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127 backup->weighted = (w != n); |
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128 backup->total_weight = w; |
| 1378 | 129 backup->name = &us->host; |
| 130 | |
| 131 n = 0; | |
| 132 | |
| 133 for (i = 0; i < us->servers->nelts; i++) { | |
| 134 for (j = 0; j < server[i].naddrs; j++) { | |
| 135 if (!server[i].backup) { | |
| 136 continue; | |
| 137 } | |
| 138 | |
| 139 backup->peer[n].sockaddr = server[i].addrs[j].sockaddr; | |
| 140 backup->peer[n].socklen = server[i].addrs[j].socklen; | |
| 141 backup->peer[n].name = server[i].addrs[j].name; | |
| 142 backup->peer[n].weight = server[i].weight; | |
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143 backup->peer[n].effective_weight = server[i].weight; |
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144 backup->peer[n].current_weight = 0; |
| 1378 | 145 backup->peer[n].max_fails = server[i].max_fails; |
| 146 backup->peer[n].fail_timeout = server[i].fail_timeout; | |
| 147 backup->peer[n].down = server[i].down; | |
| 148 n++; | |
| 149 } | |
| 150 } | |
| 151 | |
| 152 peers->next = backup; | |
| 153 | |
| 1379 | 154 ngx_sort(&backup->peer[0], (size_t) n, |
| 155 sizeof(ngx_http_upstream_rr_peer_t), | |
| 156 ngx_http_upstream_cmp_servers); | |
| 157 | |
| 884 | 158 return NGX_OK; |
| 159 } | |
| 160 | |
| 161 | |
| 162 /* an upstream implicitly defined by proxy_pass, etc. */ | |
| 163 | |
| 906 | 164 if (us->port == 0 && us->default_port == 0) { |
| 165 ngx_log_error(NGX_LOG_EMERG, cf->log, 0, | |
| 166 "no port in upstream \"%V\" in %s:%ui", | |
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167 &us->host, us->file_name, us->line); |
| 906 | 168 return NGX_ERROR; |
| 169 } | |
| 170 | |
| 884 | 171 ngx_memzero(&u, sizeof(ngx_url_t)); |
| 172 | |
| 173 u.host = us->host; | |
| 916 | 174 u.port = (in_port_t) (us->port ? us->port : us->default_port); |
| 884 | 175 |
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176 if (ngx_inet_resolve_host(cf->pool, &u) != NGX_OK) { |
| 884 | 177 if (u.err) { |
| 178 ngx_log_error(NGX_LOG_EMERG, cf->log, 0, | |
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179 "%s in upstream \"%V\" in %s:%ui", |
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180 u.err, &us->host, us->file_name, us->line); |
| 884 | 181 } |
| 182 | |
| 183 return NGX_ERROR; | |
| 184 } | |
| 185 | |
| 186 n = u.naddrs; | |
| 187 | |
| 188 peers = ngx_pcalloc(cf->pool, sizeof(ngx_http_upstream_rr_peers_t) | |
| 189 + sizeof(ngx_http_upstream_rr_peer_t) * (n - 1)); | |
| 190 if (peers == NULL) { | |
| 191 return NGX_ERROR; | |
| 192 } | |
| 193 | |
| 1378 | 194 peers->single = (n == 1); |
| 884 | 195 peers->number = n; |
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196 peers->weighted = 0; |
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197 peers->total_weight = n; |
| 884 | 198 peers->name = &us->host; |
| 199 | |
| 200 for (i = 0; i < u.naddrs; i++) { | |
| 1564 | 201 peers->peer[i].sockaddr = u.addrs[i].sockaddr; |
| 202 peers->peer[i].socklen = u.addrs[i].socklen; | |
| 203 peers->peer[i].name = u.addrs[i].name; | |
| 204 peers->peer[i].weight = 1; | |
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205 peers->peer[i].effective_weight = 1; |
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206 peers->peer[i].current_weight = 0; |
| 1564 | 207 peers->peer[i].max_fails = 1; |
| 208 peers->peer[i].fail_timeout = 10; | |
| 884 | 209 } |
| 210 | |
| 211 us->peer.data = peers; | |
| 212 | |
| 1378 | 213 /* implicitly defined upstream has no backup servers */ |
| 214 | |
| 884 | 215 return NGX_OK; |
| 216 } | |
| 217 | |
| 218 | |
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219 static ngx_int_t |
| 1379 | 220 ngx_http_upstream_cmp_servers(const void *one, const void *two) |
| 221 { | |
| 222 ngx_http_upstream_rr_peer_t *first, *second; | |
| 223 | |
| 224 first = (ngx_http_upstream_rr_peer_t *) one; | |
| 225 second = (ngx_http_upstream_rr_peer_t *) two; | |
| 226 | |
| 227 return (first->weight < second->weight); | |
| 228 } | |
| 229 | |
| 230 | |
| 884 | 231 ngx_int_t |
| 232 ngx_http_upstream_init_round_robin_peer(ngx_http_request_t *r, | |
| 233 ngx_http_upstream_srv_conf_t *us) | |
| 234 { | |
| 235 ngx_uint_t n; | |
| 236 ngx_http_upstream_rr_peer_data_t *rrp; | |
| 237 | |
| 238 rrp = r->upstream->peer.data; | |
| 239 | |
| 240 if (rrp == NULL) { | |
| 241 rrp = ngx_palloc(r->pool, sizeof(ngx_http_upstream_rr_peer_data_t)); | |
| 242 if (rrp == NULL) { | |
| 243 return NGX_ERROR; | |
| 244 } | |
| 245 | |
| 246 r->upstream->peer.data = rrp; | |
| 247 } | |
| 248 | |
| 249 rrp->peers = us->peer.data; | |
| 250 rrp->current = 0; | |
| 251 | |
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252 n = rrp->peers->number; |
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253 |
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254 if (rrp->peers->next && rrp->peers->next->number > n) { |
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255 n = rrp->peers->next->number; |
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256 } |
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257 |
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258 if (n <= 8 * sizeof(uintptr_t)) { |
| 884 | 259 rrp->tried = &rrp->data; |
| 260 rrp->data = 0; | |
| 261 | |
| 262 } else { | |
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263 n = (n + (8 * sizeof(uintptr_t) - 1)) / (8 * sizeof(uintptr_t)); |
| 884 | 264 |
| 265 rrp->tried = ngx_pcalloc(r->pool, n * sizeof(uintptr_t)); | |
| 266 if (rrp->tried == NULL) { | |
| 267 return NGX_ERROR; | |
| 268 } | |
| 269 } | |
| 270 | |
| 271 r->upstream->peer.get = ngx_http_upstream_get_round_robin_peer; | |
| 272 r->upstream->peer.free = ngx_http_upstream_free_round_robin_peer; | |
| 273 r->upstream->peer.tries = rrp->peers->number; | |
| 274 #if (NGX_HTTP_SSL) | |
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275 r->upstream->peer.set_session = |
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276 ngx_http_upstream_set_round_robin_peer_session; |
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277 r->upstream->peer.save_session = |
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278 ngx_http_upstream_save_round_robin_peer_session; |
| 884 | 279 #endif |
| 280 | |
| 281 return NGX_OK; | |
| 282 } | |
| 283 | |
| 284 | |
| 285 ngx_int_t | |
| 1658 | 286 ngx_http_upstream_create_round_robin_peer(ngx_http_request_t *r, |
| 287 ngx_http_upstream_resolved_t *ur) | |
| 288 { | |
| 289 u_char *p; | |
| 290 size_t len; | |
| 291 ngx_uint_t i, n; | |
| 292 struct sockaddr_in *sin; | |
| 293 ngx_http_upstream_rr_peers_t *peers; | |
| 294 ngx_http_upstream_rr_peer_data_t *rrp; | |
| 295 | |
| 296 rrp = r->upstream->peer.data; | |
| 297 | |
| 298 if (rrp == NULL) { | |
| 299 rrp = ngx_palloc(r->pool, sizeof(ngx_http_upstream_rr_peer_data_t)); | |
| 300 if (rrp == NULL) { | |
| 301 return NGX_ERROR; | |
| 302 } | |
| 303 | |
| 304 r->upstream->peer.data = rrp; | |
| 305 } | |
| 306 | |
| 307 peers = ngx_pcalloc(r->pool, sizeof(ngx_http_upstream_rr_peers_t) | |
| 308 + sizeof(ngx_http_upstream_rr_peer_t) * (ur->naddrs - 1)); | |
| 309 if (peers == NULL) { | |
| 310 return NGX_ERROR; | |
| 311 } | |
| 312 | |
| 313 peers->single = (ur->naddrs == 1); | |
| 314 peers->number = ur->naddrs; | |
| 315 peers->name = &ur->host; | |
| 316 | |
|
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317 if (ur->sockaddr) { |
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318 peers->peer[0].sockaddr = ur->sockaddr; |
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319 peers->peer[0].socklen = ur->socklen; |
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|
320 peers->peer[0].name = ur->host; |
|
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|
321 peers->peer[0].weight = 1; |
|
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322 peers->peer[0].effective_weight = 1; |
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323 peers->peer[0].current_weight = 0; |
|
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324 peers->peer[0].max_fails = 1; |
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325 peers->peer[0].fail_timeout = 10; |
| 1658 | 326 |
|
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327 } else { |
|
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328 |
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329 for (i = 0; i < ur->naddrs; i++) { |
| 1658 | 330 |
|
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331 len = NGX_INET_ADDRSTRLEN + sizeof(":65536") - 1; |
|
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332 |
|
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333 p = ngx_pnalloc(r->pool, len); |
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334 if (p == NULL) { |
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variable support for unix sockets in fastcgi_pass and proxy_pass
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335 return NGX_ERROR; |
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336 } |
| 1658 | 337 |
|
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338 len = ngx_inet_ntop(AF_INET, &ur->addrs[i], p, NGX_INET_ADDRSTRLEN); |
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339 len = ngx_sprintf(&p[len], ":%d", ur->port) - p; |
| 1658 | 340 |
|
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341 sin = ngx_pcalloc(r->pool, sizeof(struct sockaddr_in)); |
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342 if (sin == NULL) { |
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343 return NGX_ERROR; |
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344 } |
| 1658 | 345 |
|
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346 sin->sin_family = AF_INET; |
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347 sin->sin_port = htons(ur->port); |
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348 sin->sin_addr.s_addr = ur->addrs[i]; |
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349 |
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350 peers->peer[i].sockaddr = (struct sockaddr *) sin; |
|
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351 peers->peer[i].socklen = sizeof(struct sockaddr_in); |
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352 peers->peer[i].name.len = len; |
|
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353 peers->peer[i].name.data = p; |
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354 peers->peer[i].weight = 1; |
|
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355 peers->peer[i].effective_weight = 1; |
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356 peers->peer[i].current_weight = 0; |
|
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357 peers->peer[i].max_fails = 1; |
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358 peers->peer[i].fail_timeout = 10; |
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|
359 } |
| 1658 | 360 } |
| 361 | |
| 362 rrp->peers = peers; | |
| 363 rrp->current = 0; | |
| 364 | |
| 365 if (rrp->peers->number <= 8 * sizeof(uintptr_t)) { | |
| 366 rrp->tried = &rrp->data; | |
| 367 rrp->data = 0; | |
| 368 | |
| 369 } else { | |
| 370 n = (rrp->peers->number + (8 * sizeof(uintptr_t) - 1)) | |
| 371 / (8 * sizeof(uintptr_t)); | |
| 372 | |
| 373 rrp->tried = ngx_pcalloc(r->pool, n * sizeof(uintptr_t)); | |
| 374 if (rrp->tried == NULL) { | |
| 375 return NGX_ERROR; | |
| 376 } | |
| 377 } | |
| 378 | |
| 379 r->upstream->peer.get = ngx_http_upstream_get_round_robin_peer; | |
| 380 r->upstream->peer.free = ngx_http_upstream_free_round_robin_peer; | |
| 381 r->upstream->peer.tries = rrp->peers->number; | |
| 382 #if (NGX_HTTP_SSL) | |
|
3964
ff127ba3b091
do not try to reuse and save a SSL session for a peer created on the fly
Igor Sysoev <igor@sysoev.ru>
parents:
2422
diff
changeset
|
383 r->upstream->peer.set_session = ngx_http_upstream_empty_set_session; |
|
ff127ba3b091
do not try to reuse and save a SSL session for a peer created on the fly
Igor Sysoev <igor@sysoev.ru>
parents:
2422
diff
changeset
|
384 r->upstream->peer.save_session = ngx_http_upstream_empty_save_session; |
| 1658 | 385 #endif |
| 386 | |
| 387 return NGX_OK; | |
| 388 } | |
| 389 | |
| 390 | |
| 391 ngx_int_t | |
| 884 | 392 ngx_http_upstream_get_round_robin_peer(ngx_peer_connection_t *pc, void *data) |
| 393 { | |
| 394 ngx_http_upstream_rr_peer_data_t *rrp = data; | |
| 395 | |
| 1378 | 396 ngx_int_t rc; |
| 397 ngx_uint_t i, n; | |
| 398 ngx_connection_t *c; | |
| 399 ngx_http_upstream_rr_peer_t *peer; | |
| 400 ngx_http_upstream_rr_peers_t *peers; | |
| 884 | 401 |
| 402 ngx_log_debug1(NGX_LOG_DEBUG_HTTP, pc->log, 0, | |
| 403 "get rr peer, try: %ui", pc->tries); | |
| 404 | |
| 405 /* ngx_lock_mutex(rrp->peers->mutex); */ | |
| 406 | |
| 407 if (rrp->peers->last_cached) { | |
| 408 | |
| 409 /* cached connection */ | |
| 410 | |
| 411 c = rrp->peers->cached[rrp->peers->last_cached]; | |
| 412 rrp->peers->last_cached--; | |
| 413 | |
| 414 /* ngx_unlock_mutex(ppr->peers->mutex); */ | |
| 415 | |
| 416 #if (NGX_THREADS) | |
| 417 c->read->lock = c->read->own_lock; | |
| 418 c->write->lock = c->write->own_lock; | |
| 419 #endif | |
| 420 | |
| 421 pc->connection = c; | |
| 422 pc->cached = 1; | |
| 423 | |
| 424 return NGX_OK; | |
| 425 } | |
| 426 | |
| 427 pc->cached = 0; | |
| 428 pc->connection = NULL; | |
| 429 | |
| 1378 | 430 if (rrp->peers->single) { |
| 884 | 431 peer = &rrp->peers->peer[0]; |
| 432 | |
|
4914
dcb853acae97
Upstream: honor the "down" flag for a single server.
Ruslan Ermilov <ru@nginx.com>
parents:
4655
diff
changeset
|
433 if (peer->down) { |
|
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Upstream: honor the "down" flag for a single server.
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4655
diff
changeset
|
434 goto failed; |
|
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Upstream: honor the "down" flag for a single server.
Ruslan Ermilov <ru@nginx.com>
parents:
4655
diff
changeset
|
435 } |
|
dcb853acae97
Upstream: honor the "down" flag for a single server.
Ruslan Ermilov <ru@nginx.com>
parents:
4655
diff
changeset
|
436 |
| 884 | 437 } else { |
| 438 | |
| 439 /* there are several peers */ | |
| 440 | |
|
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Upstream: smooth weighted round-robin balancing.
Maxim Dounin <mdounin@mdounin.ru>
parents:
4569
diff
changeset
|
441 peer = ngx_http_upstream_get_peer(rrp); |
| 884 | 442 |
|
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Upstream: smooth weighted round-robin balancing.
Maxim Dounin <mdounin@mdounin.ru>
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diff
changeset
|
443 if (peer == NULL) { |
|
c90801720a0c
Upstream: smooth weighted round-robin balancing.
Maxim Dounin <mdounin@mdounin.ru>
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4569
diff
changeset
|
444 goto failed; |
| 884 | 445 } |
| 446 | |
|
4621
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Upstream: smooth weighted round-robin balancing.
Maxim Dounin <mdounin@mdounin.ru>
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4569
diff
changeset
|
447 ngx_log_debug2(NGX_LOG_DEBUG_HTTP, pc->log, 0, |
|
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Upstream: smooth weighted round-robin balancing.
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4569
diff
changeset
|
448 "get rr peer, current: %ui %i", |
|
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Upstream: smooth weighted round-robin balancing.
Maxim Dounin <mdounin@mdounin.ru>
parents:
4569
diff
changeset
|
449 rrp->current, peer->current_weight); |
| 884 | 450 } |
| 451 | |
| 452 pc->sockaddr = peer->sockaddr; | |
| 453 pc->socklen = peer->socklen; | |
| 454 pc->name = &peer->name; | |
| 455 | |
| 456 /* ngx_unlock_mutex(rrp->peers->mutex); */ | |
| 457 | |
| 1378 | 458 if (pc->tries == 1 && rrp->peers->next) { |
| 459 pc->tries += rrp->peers->next->number; | |
| 460 } | |
| 461 | |
| 884 | 462 return NGX_OK; |
| 463 | |
| 464 failed: | |
| 465 | |
| 1378 | 466 peers = rrp->peers; |
| 467 | |
| 468 if (peers->next) { | |
| 469 | |
| 470 /* ngx_unlock_mutex(peers->mutex); */ | |
| 471 | |
| 472 ngx_log_debug0(NGX_LOG_DEBUG_HTTP, pc->log, 0, "backup servers"); | |
| 473 | |
| 474 rrp->peers = peers->next; | |
| 475 pc->tries = rrp->peers->number; | |
| 476 | |
|
4991
a384c60d55f3
Upstream: fixed state resetting when switching to backup servers.
Valentin Bartenev <vbart@nginx.com>
parents:
4914
diff
changeset
|
477 n = (rrp->peers->number + (8 * sizeof(uintptr_t) - 1)) |
|
a384c60d55f3
Upstream: fixed state resetting when switching to backup servers.
Valentin Bartenev <vbart@nginx.com>
parents:
4914
diff
changeset
|
478 / (8 * sizeof(uintptr_t)); |
|
a384c60d55f3
Upstream: fixed state resetting when switching to backup servers.
Valentin Bartenev <vbart@nginx.com>
parents:
4914
diff
changeset
|
479 |
| 1389 | 480 for (i = 0; i < n; i++) { |
| 1378 | 481 rrp->tried[i] = 0; |
| 482 } | |
| 483 | |
| 484 rc = ngx_http_upstream_get_round_robin_peer(pc, rrp); | |
| 485 | |
| 486 if (rc != NGX_BUSY) { | |
| 487 return rc; | |
| 488 } | |
| 489 | |
| 490 /* ngx_lock_mutex(peers->mutex); */ | |
| 491 } | |
| 492 | |
| 884 | 493 /* all peers failed, mark them as live for quick recovery */ |
| 494 | |
| 1378 | 495 for (i = 0; i < peers->number; i++) { |
| 496 peers->peer[i].fails = 0; | |
| 884 | 497 } |
| 498 | |
| 1378 | 499 /* ngx_unlock_mutex(peers->mutex); */ |
| 884 | 500 |
| 1378 | 501 pc->name = peers->name; |
| 884 | 502 |
| 503 return NGX_BUSY; | |
| 504 } | |
| 505 | |
| 506 | |
|
4621
c90801720a0c
Upstream: smooth weighted round-robin balancing.
Maxim Dounin <mdounin@mdounin.ru>
parents:
4569
diff
changeset
|
507 static ngx_http_upstream_rr_peer_t * |
|
c90801720a0c
Upstream: smooth weighted round-robin balancing.
Maxim Dounin <mdounin@mdounin.ru>
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4569
diff
changeset
|
508 ngx_http_upstream_get_peer(ngx_http_upstream_rr_peer_data_t *rrp) |
|
1344
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fair upstream weight balancer
Igor Sysoev <igor@sysoev.ru>
parents:
1284
diff
changeset
|
509 { |
|
4621
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Upstream: smooth weighted round-robin balancing.
Maxim Dounin <mdounin@mdounin.ru>
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4569
diff
changeset
|
510 time_t now; |
|
c90801720a0c
Upstream: smooth weighted round-robin balancing.
Maxim Dounin <mdounin@mdounin.ru>
parents:
4569
diff
changeset
|
511 uintptr_t m; |
|
c90801720a0c
Upstream: smooth weighted round-robin balancing.
Maxim Dounin <mdounin@mdounin.ru>
parents:
4569
diff
changeset
|
512 ngx_int_t total; |
|
c90801720a0c
Upstream: smooth weighted round-robin balancing.
Maxim Dounin <mdounin@mdounin.ru>
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4569
diff
changeset
|
513 ngx_uint_t i, n; |
|
c90801720a0c
Upstream: smooth weighted round-robin balancing.
Maxim Dounin <mdounin@mdounin.ru>
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diff
changeset
|
514 ngx_http_upstream_rr_peer_t *peer, *best; |
|
1344
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fair upstream weight balancer
Igor Sysoev <igor@sysoev.ru>
parents:
1284
diff
changeset
|
515 |
|
4621
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Upstream: smooth weighted round-robin balancing.
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changeset
|
516 now = ngx_time(); |
|
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diff
changeset
|
517 |
|
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Upstream: smooth weighted round-robin balancing.
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diff
changeset
|
518 best = NULL; |
|
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Upstream: smooth weighted round-robin balancing.
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diff
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|
519 total = 0; |
|
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fair upstream weight balancer
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1284
diff
changeset
|
520 |
|
4621
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Upstream: smooth weighted round-robin balancing.
Maxim Dounin <mdounin@mdounin.ru>
parents:
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diff
changeset
|
521 for (i = 0; i < rrp->peers->number; i++) { |
|
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fair upstream weight balancer
Igor Sysoev <igor@sysoev.ru>
parents:
1284
diff
changeset
|
522 |
|
4621
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Upstream: smooth weighted round-robin balancing.
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parents:
4569
diff
changeset
|
523 n = i / (8 * sizeof(uintptr_t)); |
|
c90801720a0c
Upstream: smooth weighted round-robin balancing.
Maxim Dounin <mdounin@mdounin.ru>
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4569
diff
changeset
|
524 m = (uintptr_t) 1 << i % (8 * sizeof(uintptr_t)); |
|
1344
8f5b5641966c
fair upstream weight balancer
Igor Sysoev <igor@sysoev.ru>
parents:
1284
diff
changeset
|
525 |
|
4621
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Upstream: smooth weighted round-robin balancing.
Maxim Dounin <mdounin@mdounin.ru>
parents:
4569
diff
changeset
|
526 if (rrp->tried[n] & m) { |
|
c90801720a0c
Upstream: smooth weighted round-robin balancing.
Maxim Dounin <mdounin@mdounin.ru>
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4569
diff
changeset
|
527 continue; |
|
c90801720a0c
Upstream: smooth weighted round-robin balancing.
Maxim Dounin <mdounin@mdounin.ru>
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4569
diff
changeset
|
528 } |
|
1344
8f5b5641966c
fair upstream weight balancer
Igor Sysoev <igor@sysoev.ru>
parents:
1284
diff
changeset
|
529 |
|
4621
c90801720a0c
Upstream: smooth weighted round-robin balancing.
Maxim Dounin <mdounin@mdounin.ru>
parents:
4569
diff
changeset
|
530 peer = &rrp->peers->peer[i]; |
|
1344
8f5b5641966c
fair upstream weight balancer
Igor Sysoev <igor@sysoev.ru>
parents:
1284
diff
changeset
|
531 |
|
4621
c90801720a0c
Upstream: smooth weighted round-robin balancing.
Maxim Dounin <mdounin@mdounin.ru>
parents:
4569
diff
changeset
|
532 if (peer->down) { |
|
c90801720a0c
Upstream: smooth weighted round-robin balancing.
Maxim Dounin <mdounin@mdounin.ru>
parents:
4569
diff
changeset
|
533 continue; |
|
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|
534 } |
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|
535 |
|
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|
536 if (peer->max_fails |
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537 && peer->fails >= peer->max_fails |
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Upstream: smooth weighted round-robin balancing.
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|
538 && now - peer->checked <= peer->fail_timeout) |
|
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Upstream: smooth weighted round-robin balancing.
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|
539 { |
|
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Upstream: smooth weighted round-robin balancing.
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|
540 continue; |
|
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Upstream: smooth weighted round-robin balancing.
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|
541 } |
|
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Upstream: smooth weighted round-robin balancing.
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|
542 |
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543 peer->current_weight += peer->effective_weight; |
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544 total += peer->effective_weight; |
|
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|
545 |
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|
546 if (peer->effective_weight < peer->weight) { |
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|
547 peer->effective_weight++; |
|
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Fixing cpu hog with all upstream servers marked "down".
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|
548 } |
|
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Fixing cpu hog with all upstream servers marked "down".
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|
549 |
|
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550 if (best == NULL || peer->current_weight > best->current_weight) { |
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551 best = peer; |
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552 } |
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553 } |
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|
554 |
|
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|
555 if (best == NULL) { |
|
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|
556 return NULL; |
|
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Upstream: smooth weighted round-robin balancing.
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|
557 } |
|
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|
558 |
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|
559 i = best - &rrp->peers->peer[0]; |
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|
560 |
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561 rrp->current = i; |
|
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|
562 |
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563 n = i / (8 * sizeof(uintptr_t)); |
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564 m = (uintptr_t) 1 << i % (8 * sizeof(uintptr_t)); |
|
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|
565 |
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|
566 rrp->tried[n] |= m; |
|
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Upstream: smooth weighted round-robin balancing.
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|
567 |
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|
568 best->current_weight -= total; |
|
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|
569 best->checked = now; |
|
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Upstream: smooth weighted round-robin balancing.
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|
570 |
|
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|
571 return best; |
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572 } |
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|
573 |
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574 |
| 884 | 575 void |
| 576 ngx_http_upstream_free_round_robin_peer(ngx_peer_connection_t *pc, void *data, | |
| 577 ngx_uint_t state) | |
| 578 { | |
| 579 ngx_http_upstream_rr_peer_data_t *rrp = data; | |
| 580 | |
| 581 time_t now; | |
| 582 ngx_http_upstream_rr_peer_t *peer; | |
| 583 | |
| 584 ngx_log_debug2(NGX_LOG_DEBUG_HTTP, pc->log, 0, | |
| 585 "free rr peer %ui %ui", pc->tries, state); | |
| 586 | |
| 587 if (state == 0 && pc->tries == 0) { | |
| 588 return; | |
| 589 } | |
| 590 | |
| 591 /* TODO: NGX_PEER_KEEPALIVE */ | |
| 592 | |
| 1378 | 593 if (rrp->peers->single) { |
| 884 | 594 pc->tries = 0; |
| 595 return; | |
| 596 } | |
| 597 | |
|
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Better recheck of dead upstream servers.
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|
598 peer = &rrp->peers->peer[rrp->current]; |
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|
599 |
| 884 | 600 if (state & NGX_PEER_FAILED) { |
| 601 now = ngx_time(); | |
| 602 | |
| 603 /* ngx_lock_mutex(rrp->peers->mutex); */ | |
| 604 | |
| 605 peer->fails++; | |
| 606 peer->accessed = now; | |
|
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|
607 peer->checked = now; |
| 884 | 608 |
|
2204
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fix divide by zero if max_fails=0
Igor Sysoev <igor@sysoev.ru>
parents:
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changeset
|
609 if (peer->max_fails) { |
|
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|
610 peer->effective_weight -= peer->weight / peer->max_fails; |
|
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parents:
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|
611 } |
|
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|
612 |
|
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|
613 ngx_log_debug2(NGX_LOG_DEBUG_HTTP, pc->log, 0, |
|
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diff
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|
614 "free rr peer failed: %ui %i", |
|
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|
615 rrp->current, peer->effective_weight); |
|
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|
616 |
|
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|
617 if (peer->effective_weight < 0) { |
|
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Upstream: smooth weighted round-robin balancing.
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|
618 peer->effective_weight = 0; |
| 884 | 619 } |
| 620 | |
| 621 /* ngx_unlock_mutex(rrp->peers->mutex); */ | |
|
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Better recheck of dead upstream servers.
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|
622 |
|
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Better recheck of dead upstream servers.
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|
623 } else { |
|
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Better recheck of dead upstream servers.
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|
624 |
|
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Better recheck of dead upstream servers.
Maxim Dounin <mdounin@mdounin.ru>
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changeset
|
625 /* mark peer live if check passed */ |
|
4fc91bae6f83
Better recheck of dead upstream servers.
Maxim Dounin <mdounin@mdounin.ru>
parents:
4011
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changeset
|
626 |
|
4fc91bae6f83
Better recheck of dead upstream servers.
Maxim Dounin <mdounin@mdounin.ru>
parents:
4011
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changeset
|
627 if (peer->accessed < peer->checked) { |
|
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Better recheck of dead upstream servers.
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parents:
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|
628 peer->fails = 0; |
|
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Better recheck of dead upstream servers.
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|
629 } |
| 884 | 630 } |
| 631 | |
| 632 if (pc->tries) { | |
| 633 pc->tries--; | |
| 634 } | |
| 635 | |
| 636 /* ngx_unlock_mutex(rrp->peers->mutex); */ | |
| 637 } | |
| 638 | |
| 639 | |
| 640 #if (NGX_HTTP_SSL) | |
| 641 | |
|
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fix segfault when session was freed twice
Igor Sysoev <igor@sysoev.ru>
parents:
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diff
changeset
|
642 ngx_int_t |
|
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fix segfault when session was freed twice
Igor Sysoev <igor@sysoev.ru>
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diff
changeset
|
643 ngx_http_upstream_set_round_robin_peer_session(ngx_peer_connection_t *pc, |
|
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fix segfault when session was freed twice
Igor Sysoev <igor@sysoev.ru>
parents:
1206
diff
changeset
|
644 void *data) |
| 884 | 645 { |
| 646 ngx_http_upstream_rr_peer_data_t *rrp = data; | |
| 647 | |
|
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fix segfault when session was freed twice
Igor Sysoev <igor@sysoev.ru>
parents:
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diff
changeset
|
648 ngx_int_t rc; |
| 884 | 649 ngx_ssl_session_t *ssl_session; |
| 650 ngx_http_upstream_rr_peer_t *peer; | |
| 651 | |
|
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diff
changeset
|
652 peer = &rrp->peers->peer[rrp->current]; |
|
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fix segfault when session was freed twice
Igor Sysoev <igor@sysoev.ru>
parents:
1206
diff
changeset
|
653 |
|
be2b895d31e0
fix segfault when session was freed twice
Igor Sysoev <igor@sysoev.ru>
parents:
1206
diff
changeset
|
654 /* TODO: threads only mutex */ |
|
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fix segfault when session was freed twice
Igor Sysoev <igor@sysoev.ru>
parents:
1206
diff
changeset
|
655 /* ngx_lock_mutex(rrp->peers->mutex); */ |
|
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fix segfault when session was freed twice
Igor Sysoev <igor@sysoev.ru>
parents:
1206
diff
changeset
|
656 |
|
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fix segfault when session was freed twice
Igor Sysoev <igor@sysoev.ru>
parents:
1206
diff
changeset
|
657 ssl_session = peer->ssl_session; |
|
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fix segfault when session was freed twice
Igor Sysoev <igor@sysoev.ru>
parents:
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diff
changeset
|
658 |
|
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fix segfault when session was freed twice
Igor Sysoev <igor@sysoev.ru>
parents:
1206
diff
changeset
|
659 rc = ngx_ssl_set_session(pc->connection, ssl_session); |
|
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fix segfault when session was freed twice
Igor Sysoev <igor@sysoev.ru>
parents:
1206
diff
changeset
|
660 |
|
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fix segfault when session was freed twice
Igor Sysoev <igor@sysoev.ru>
parents:
1206
diff
changeset
|
661 ngx_log_debug2(NGX_LOG_DEBUG_HTTP, pc->log, 0, |
| 1443 | 662 "set session: %p:%d", |
| 663 ssl_session, ssl_session ? ssl_session->references : 0); | |
|
1284
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fix segfault when session was freed twice
Igor Sysoev <igor@sysoev.ru>
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diff
changeset
|
664 |
|
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fix segfault when session was freed twice
Igor Sysoev <igor@sysoev.ru>
parents:
1206
diff
changeset
|
665 /* ngx_unlock_mutex(rrp->peers->mutex); */ |
|
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fix segfault when session was freed twice
Igor Sysoev <igor@sysoev.ru>
parents:
1206
diff
changeset
|
666 |
|
be2b895d31e0
fix segfault when session was freed twice
Igor Sysoev <igor@sysoev.ru>
parents:
1206
diff
changeset
|
667 return rc; |
|
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fix segfault when session was freed twice
Igor Sysoev <igor@sysoev.ru>
parents:
1206
diff
changeset
|
668 } |
|
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fix segfault when session was freed twice
Igor Sysoev <igor@sysoev.ru>
parents:
1206
diff
changeset
|
669 |
|
be2b895d31e0
fix segfault when session was freed twice
Igor Sysoev <igor@sysoev.ru>
parents:
1206
diff
changeset
|
670 |
|
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fix segfault when session was freed twice
Igor Sysoev <igor@sysoev.ru>
parents:
1206
diff
changeset
|
671 void |
|
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fix segfault when session was freed twice
Igor Sysoev <igor@sysoev.ru>
parents:
1206
diff
changeset
|
672 ngx_http_upstream_save_round_robin_peer_session(ngx_peer_connection_t *pc, |
|
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Igor Sysoev <igor@sysoev.ru>
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changeset
|
673 void *data) |
|
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changeset
|
674 { |
|
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Igor Sysoev <igor@sysoev.ru>
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changeset
|
675 ngx_http_upstream_rr_peer_data_t *rrp = data; |
|
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changeset
|
676 |
|
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Igor Sysoev <igor@sysoev.ru>
parents:
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diff
changeset
|
677 ngx_ssl_session_t *old_ssl_session, *ssl_session; |
|
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changeset
|
678 ngx_http_upstream_rr_peer_t *peer; |
|
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fix segfault when session was freed twice
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parents:
1206
diff
changeset
|
679 |
| 884 | 680 ssl_session = ngx_ssl_get_session(pc->connection); |
| 681 | |
| 682 if (ssl_session == NULL) { | |
| 683 return; | |
| 684 } | |
| 685 | |
|
1284
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fix segfault when session was freed twice
Igor Sysoev <igor@sysoev.ru>
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diff
changeset
|
686 ngx_log_debug2(NGX_LOG_DEBUG_HTTP, pc->log, 0, |
| 1443 | 687 "save session: %p:%d", ssl_session, ssl_session->references); |
|
1284
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Igor Sysoev <igor@sysoev.ru>
parents:
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diff
changeset
|
688 |
| 884 | 689 peer = &rrp->peers->peer[rrp->current]; |
| 690 | |
|
1284
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fix segfault when session was freed twice
Igor Sysoev <igor@sysoev.ru>
parents:
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diff
changeset
|
691 /* TODO: threads only mutex */ |
| 884 | 692 /* ngx_lock_mutex(rrp->peers->mutex); */ |
|
1284
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fix segfault when session was freed twice
Igor Sysoev <igor@sysoev.ru>
parents:
1206
diff
changeset
|
693 |
|
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fix segfault when session was freed twice
Igor Sysoev <igor@sysoev.ru>
parents:
1206
diff
changeset
|
694 old_ssl_session = peer->ssl_session; |
| 884 | 695 peer->ssl_session = ssl_session; |
|
1284
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Igor Sysoev <igor@sysoev.ru>
parents:
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diff
changeset
|
696 |
| 884 | 697 /* ngx_unlock_mutex(rrp->peers->mutex); */ |
| 698 | |
|
1284
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parents:
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diff
changeset
|
699 if (old_ssl_session) { |
|
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fix segfault when session was freed twice
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diff
changeset
|
700 |
|
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fix segfault when session was freed twice
Igor Sysoev <igor@sysoev.ru>
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1206
diff
changeset
|
701 ngx_log_debug2(NGX_LOG_DEBUG_HTTP, pc->log, 0, |
| 1443 | 702 "old session: %p:%d", |
|
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703 old_ssl_session, old_ssl_session->references); |
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704 |
| 884 | 705 /* TODO: may block */ |
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706 |
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707 ngx_ssl_free_session(old_ssl_session); |
| 884 | 708 } |
| 709 } | |
| 710 | |
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3964
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711 |
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712 static ngx_int_t |
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713 ngx_http_upstream_empty_set_session(ngx_peer_connection_t *pc, void *data) |
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714 { |
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715 return NGX_OK; |
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716 } |
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717 |
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718 |
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719 static void |
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720 ngx_http_upstream_empty_save_session(ngx_peer_connection_t *pc, void *data) |
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721 { |
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722 return; |
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723 } |
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724 |
| 884 | 725 #endif |