Mercurial > hg > nginx
annotate src/stream/ngx_stream_upstream_hash_module.c @ 7660:d33e17499088
Version bump.
| author | Maxim Dounin <mdounin@mdounin.ru> |
|---|---|
| date | Tue, 26 May 2020 22:03:00 +0300 |
| parents | d964b0aee8e7 |
| children |
| rev | line source |
|---|---|
| 6115 | 1 |
| 2 /* | |
| 3 * Copyright (C) Roman Arutyunyan | |
| 4 * Copyright (C) Nginx, Inc. | |
| 5 */ | |
| 6 | |
| 7 | |
| 8 #include <ngx_config.h> | |
| 9 #include <ngx_core.h> | |
| 10 #include <ngx_stream.h> | |
| 11 | |
| 12 | |
| 13 typedef struct { | |
| 14 uint32_t hash; | |
| 15 ngx_str_t *server; | |
| 16 } ngx_stream_upstream_chash_point_t; | |
| 17 | |
| 18 | |
| 19 typedef struct { | |
| 20 ngx_uint_t number; | |
| 21 ngx_stream_upstream_chash_point_t point[1]; | |
| 22 } ngx_stream_upstream_chash_points_t; | |
| 23 | |
| 24 | |
| 25 typedef struct { | |
|
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26 ngx_stream_complex_value_t key; |
| 6115 | 27 ngx_stream_upstream_chash_points_t *points; |
| 28 } ngx_stream_upstream_hash_srv_conf_t; | |
| 29 | |
| 30 | |
| 31 typedef struct { | |
| 32 /* the round robin data must be first */ | |
| 33 ngx_stream_upstream_rr_peer_data_t rrp; | |
| 34 ngx_stream_upstream_hash_srv_conf_t *conf; | |
| 35 ngx_str_t key; | |
| 36 ngx_uint_t tries; | |
| 37 ngx_uint_t rehash; | |
| 38 uint32_t hash; | |
| 39 ngx_event_get_peer_pt get_rr_peer; | |
| 40 } ngx_stream_upstream_hash_peer_data_t; | |
| 41 | |
| 42 | |
| 43 static ngx_int_t ngx_stream_upstream_init_hash(ngx_conf_t *cf, | |
| 44 ngx_stream_upstream_srv_conf_t *us); | |
| 45 static ngx_int_t ngx_stream_upstream_init_hash_peer(ngx_stream_session_t *s, | |
| 46 ngx_stream_upstream_srv_conf_t *us); | |
| 47 static ngx_int_t ngx_stream_upstream_get_hash_peer(ngx_peer_connection_t *pc, | |
| 48 void *data); | |
| 49 | |
| 50 static ngx_int_t ngx_stream_upstream_init_chash(ngx_conf_t *cf, | |
| 51 ngx_stream_upstream_srv_conf_t *us); | |
| 52 static int ngx_libc_cdecl | |
| 53 ngx_stream_upstream_chash_cmp_points(const void *one, const void *two); | |
| 54 static ngx_uint_t ngx_stream_upstream_find_chash_point( | |
| 55 ngx_stream_upstream_chash_points_t *points, uint32_t hash); | |
| 56 static ngx_int_t ngx_stream_upstream_init_chash_peer(ngx_stream_session_t *s, | |
| 57 ngx_stream_upstream_srv_conf_t *us); | |
| 58 static ngx_int_t ngx_stream_upstream_get_chash_peer(ngx_peer_connection_t *pc, | |
| 59 void *data); | |
| 60 | |
| 61 static void *ngx_stream_upstream_hash_create_conf(ngx_conf_t *cf); | |
| 62 static char *ngx_stream_upstream_hash(ngx_conf_t *cf, ngx_command_t *cmd, | |
| 63 void *conf); | |
| 64 | |
| 65 | |
| 66 static ngx_command_t ngx_stream_upstream_hash_commands[] = { | |
| 67 | |
| 68 { ngx_string("hash"), | |
| 69 NGX_STREAM_UPS_CONF|NGX_CONF_TAKE12, | |
| 70 ngx_stream_upstream_hash, | |
| 71 NGX_STREAM_SRV_CONF_OFFSET, | |
| 72 0, | |
| 73 NULL }, | |
| 74 | |
| 75 ngx_null_command | |
| 76 }; | |
| 77 | |
| 78 | |
| 79 static ngx_stream_module_t ngx_stream_upstream_hash_module_ctx = { | |
|
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80 NULL, /* preconfiguration */ |
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81 NULL, /* postconfiguration */ |
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82 |
| 6115 | 83 NULL, /* create main configuration */ |
| 84 NULL, /* init main configuration */ | |
| 85 | |
| 86 ngx_stream_upstream_hash_create_conf, /* create server configuration */ | |
| 6629 | 87 NULL /* merge server configuration */ |
| 6115 | 88 }; |
| 89 | |
| 90 | |
| 91 ngx_module_t ngx_stream_upstream_hash_module = { | |
| 92 NGX_MODULE_V1, | |
| 93 &ngx_stream_upstream_hash_module_ctx, /* module context */ | |
| 94 ngx_stream_upstream_hash_commands, /* module directives */ | |
| 95 NGX_STREAM_MODULE, /* module type */ | |
| 96 NULL, /* init master */ | |
| 97 NULL, /* init module */ | |
| 98 NULL, /* init process */ | |
| 99 NULL, /* init thread */ | |
| 100 NULL, /* exit thread */ | |
| 101 NULL, /* exit process */ | |
| 102 NULL, /* exit master */ | |
| 103 NGX_MODULE_V1_PADDING | |
| 104 }; | |
| 105 | |
| 106 | |
| 107 static ngx_int_t | |
| 108 ngx_stream_upstream_init_hash(ngx_conf_t *cf, | |
| 109 ngx_stream_upstream_srv_conf_t *us) | |
| 110 { | |
| 111 if (ngx_stream_upstream_init_round_robin(cf, us) != NGX_OK) { | |
| 112 return NGX_ERROR; | |
| 113 } | |
| 114 | |
| 115 us->peer.init = ngx_stream_upstream_init_hash_peer; | |
| 116 | |
| 117 return NGX_OK; | |
| 118 } | |
| 119 | |
| 120 | |
| 121 static ngx_int_t | |
| 122 ngx_stream_upstream_init_hash_peer(ngx_stream_session_t *s, | |
| 123 ngx_stream_upstream_srv_conf_t *us) | |
| 124 { | |
| 125 ngx_stream_upstream_hash_srv_conf_t *hcf; | |
| 126 ngx_stream_upstream_hash_peer_data_t *hp; | |
| 127 | |
| 128 hp = ngx_palloc(s->connection->pool, | |
| 129 sizeof(ngx_stream_upstream_hash_peer_data_t)); | |
| 130 if (hp == NULL) { | |
| 131 return NGX_ERROR; | |
| 132 } | |
| 133 | |
| 134 s->upstream->peer.data = &hp->rrp; | |
| 135 | |
| 136 if (ngx_stream_upstream_init_round_robin_peer(s, us) != NGX_OK) { | |
| 137 return NGX_ERROR; | |
| 138 } | |
| 139 | |
| 140 s->upstream->peer.get = ngx_stream_upstream_get_hash_peer; | |
| 141 | |
| 142 hcf = ngx_stream_conf_upstream_srv_conf(us, | |
| 143 ngx_stream_upstream_hash_module); | |
| 144 | |
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Stream: got rid of pseudo variables.
Vladimir Homutov <vl@nginx.com>
parents:
6606
diff
changeset
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145 if (ngx_stream_complex_value(s, &hcf->key, &hp->key) != NGX_OK) { |
|
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Stream: got rid of pseudo variables.
Vladimir Homutov <vl@nginx.com>
parents:
6606
diff
changeset
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146 return NGX_ERROR; |
|
d5b5866c06c4
Stream: got rid of pseudo variables.
Vladimir Homutov <vl@nginx.com>
parents:
6606
diff
changeset
|
147 } |
| 6115 | 148 |
| 149 ngx_log_debug1(NGX_LOG_DEBUG_STREAM, s->connection->log, 0, | |
| 150 "upstream hash key:\"%V\"", &hp->key); | |
| 151 | |
| 152 hp->conf = hcf; | |
| 153 hp->tries = 0; | |
| 154 hp->rehash = 0; | |
| 155 hp->hash = 0; | |
| 156 hp->get_rr_peer = ngx_stream_upstream_get_round_robin_peer; | |
| 157 | |
| 158 return NGX_OK; | |
| 159 } | |
| 160 | |
| 161 | |
| 162 static ngx_int_t | |
| 163 ngx_stream_upstream_get_hash_peer(ngx_peer_connection_t *pc, void *data) | |
| 164 { | |
| 165 ngx_stream_upstream_hash_peer_data_t *hp = data; | |
| 166 | |
| 167 time_t now; | |
| 168 u_char buf[NGX_INT_T_LEN]; | |
| 169 size_t size; | |
| 170 uint32_t hash; | |
| 171 ngx_int_t w; | |
| 172 uintptr_t m; | |
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Upstream: simplified ip_hash and hash peer selection code.
Ruslan Ermilov <ru@nginx.com>
parents:
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diff
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173 ngx_uint_t n, p; |
| 6115 | 174 ngx_stream_upstream_rr_peer_t *peer; |
| 175 | |
| 176 ngx_log_debug1(NGX_LOG_DEBUG_STREAM, pc->log, 0, | |
| 177 "get hash peer, try: %ui", pc->tries); | |
| 178 | |
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179 ngx_stream_upstream_rr_peers_rlock(hp->rrp.peers); |
| 6115 | 180 |
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Upstream hash: fall back to round-robin if hash key is empty.
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181 if (hp->tries > 20 || hp->rrp.peers->single || hp->key.len == 0) { |
| 6115 | 182 ngx_stream_upstream_rr_peers_unlock(hp->rrp.peers); |
| 183 return hp->get_rr_peer(pc, &hp->rrp); | |
| 184 } | |
| 185 | |
| 186 now = ngx_time(); | |
| 187 | |
| 188 pc->connection = NULL; | |
| 189 | |
| 190 for ( ;; ) { | |
| 191 | |
| 192 /* | |
| 193 * Hash expression is compatible with Cache::Memcached: | |
| 194 * ((crc32([REHASH] KEY) >> 16) & 0x7fff) + PREV_HASH | |
| 195 * with REHASH omitted at the first iteration. | |
| 196 */ | |
| 197 | |
| 198 ngx_crc32_init(hash); | |
| 199 | |
| 200 if (hp->rehash > 0) { | |
| 201 size = ngx_sprintf(buf, "%ui", hp->rehash) - buf; | |
| 202 ngx_crc32_update(&hash, buf, size); | |
| 203 } | |
| 204 | |
| 205 ngx_crc32_update(&hash, hp->key.data, hp->key.len); | |
| 206 ngx_crc32_final(hash); | |
| 207 | |
| 208 hash = (hash >> 16) & 0x7fff; | |
| 209 | |
| 210 hp->hash += hash; | |
| 211 hp->rehash++; | |
| 212 | |
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Upstream: simplified ip_hash and hash peer selection code.
Ruslan Ermilov <ru@nginx.com>
parents:
6115
diff
changeset
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213 w = hp->hash % hp->rrp.peers->total_weight; |
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214 peer = hp->rrp.peers->peer; |
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parents:
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diff
changeset
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215 p = 0; |
| 6115 | 216 |
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parents:
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diff
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217 while (w >= peer->weight) { |
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parents:
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diff
changeset
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218 w -= peer->weight; |
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parents:
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219 peer = peer->next; |
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changeset
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220 p++; |
| 6115 | 221 } |
| 222 | |
| 223 n = p / (8 * sizeof(uintptr_t)); | |
| 224 m = (uintptr_t) 1 << p % (8 * sizeof(uintptr_t)); | |
| 225 | |
| 226 if (hp->rrp.tried[n] & m) { | |
| 227 goto next; | |
| 228 } | |
| 229 | |
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230 ngx_stream_upstream_rr_peer_lock(hp->rrp.peers, peer); |
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parents:
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changeset
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231 |
| 6115 | 232 ngx_log_debug2(NGX_LOG_DEBUG_STREAM, pc->log, 0, |
| 233 "get hash peer, value:%uD, peer:%ui", hp->hash, p); | |
| 234 | |
| 235 if (peer->down) { | |
|
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Upstream: improved peer selection concurrency for hash and ip_hash.
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parents:
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changeset
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236 ngx_stream_upstream_rr_peer_unlock(hp->rrp.peers, peer); |
| 6115 | 237 goto next; |
| 238 } | |
| 239 | |
| 240 if (peer->max_fails | |
| 241 && peer->fails >= peer->max_fails | |
| 242 && now - peer->checked <= peer->fail_timeout) | |
| 243 { | |
|
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parents:
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244 ngx_stream_upstream_rr_peer_unlock(hp->rrp.peers, peer); |
| 6115 | 245 goto next; |
| 246 } | |
| 247 | |
| 6705 | 248 if (peer->max_conns && peer->conns >= peer->max_conns) { |
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parents:
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249 ngx_stream_upstream_rr_peer_unlock(hp->rrp.peers, peer); |
| 6705 | 250 goto next; |
| 251 } | |
| 252 | |
| 6115 | 253 break; |
| 254 | |
| 255 next: | |
| 256 | |
| 257 if (++hp->tries > 20) { | |
| 258 ngx_stream_upstream_rr_peers_unlock(hp->rrp.peers); | |
| 259 return hp->get_rr_peer(pc, &hp->rrp); | |
| 260 } | |
| 261 } | |
| 262 | |
| 263 hp->rrp.current = peer; | |
| 264 | |
| 265 pc->sockaddr = peer->sockaddr; | |
| 266 pc->socklen = peer->socklen; | |
| 267 pc->name = &peer->name; | |
| 268 | |
| 269 peer->conns++; | |
| 270 | |
| 271 if (now - peer->checked > peer->fail_timeout) { | |
| 272 peer->checked = now; | |
| 273 } | |
| 274 | |
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parents:
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changeset
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275 ngx_stream_upstream_rr_peer_unlock(hp->rrp.peers, peer); |
| 6115 | 276 ngx_stream_upstream_rr_peers_unlock(hp->rrp.peers); |
| 277 | |
| 278 hp->rrp.tried[n] |= m; | |
| 279 | |
| 280 return NGX_OK; | |
| 281 } | |
| 282 | |
| 283 | |
| 284 static ngx_int_t | |
| 285 ngx_stream_upstream_init_chash(ngx_conf_t *cf, | |
| 286 ngx_stream_upstream_srv_conf_t *us) | |
| 287 { | |
| 288 u_char *host, *port, c; | |
| 289 size_t host_len, port_len, size; | |
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Upstream hash: consistency across little/big endianness.
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290 uint32_t hash, base_hash; |
| 6115 | 291 ngx_str_t *server; |
| 292 ngx_uint_t npoints, i, j; | |
| 293 ngx_stream_upstream_rr_peer_t *peer; | |
| 294 ngx_stream_upstream_rr_peers_t *peers; | |
| 295 ngx_stream_upstream_chash_points_t *points; | |
| 296 ngx_stream_upstream_hash_srv_conf_t *hcf; | |
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Upstream hash: consistency across little/big endianness.
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297 union { |
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parents:
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298 uint32_t value; |
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Upstream hash: consistency across little/big endianness.
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parents:
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299 u_char byte[4]; |
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Upstream hash: consistency across little/big endianness.
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parents:
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changeset
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300 } prev_hash; |
| 6115 | 301 |
| 302 if (ngx_stream_upstream_init_round_robin(cf, us) != NGX_OK) { | |
| 303 return NGX_ERROR; | |
| 304 } | |
| 305 | |
| 306 us->peer.init = ngx_stream_upstream_init_chash_peer; | |
| 307 | |
| 308 peers = us->peer.data; | |
| 309 npoints = peers->total_weight * 160; | |
| 310 | |
| 311 size = sizeof(ngx_stream_upstream_chash_points_t) | |
| 312 + sizeof(ngx_stream_upstream_chash_point_t) * (npoints - 1); | |
| 313 | |
| 314 points = ngx_palloc(cf->pool, size); | |
| 315 if (points == NULL) { | |
| 316 return NGX_ERROR; | |
| 317 } | |
| 318 | |
| 319 points->number = 0; | |
| 320 | |
| 321 for (peer = peers->peer; peer; peer = peer->next) { | |
| 322 server = &peer->server; | |
| 323 | |
| 324 /* | |
| 325 * Hash expression is compatible with Cache::Memcached::Fast: | |
| 326 * crc32(HOST \0 PORT PREV_HASH). | |
| 327 */ | |
| 328 | |
| 329 if (server->len >= 5 | |
| 330 && ngx_strncasecmp(server->data, (u_char *) "unix:", 5) == 0) | |
| 331 { | |
| 332 host = server->data + 5; | |
| 333 host_len = server->len - 5; | |
| 334 port = NULL; | |
| 335 port_len = 0; | |
| 336 goto done; | |
| 337 } | |
| 338 | |
| 339 for (j = 0; j < server->len; j++) { | |
| 340 c = server->data[server->len - j - 1]; | |
| 341 | |
| 342 if (c == ':') { | |
| 343 host = server->data; | |
| 344 host_len = server->len - j - 1; | |
| 345 port = server->data + server->len - j; | |
| 346 port_len = j; | |
| 347 goto done; | |
| 348 } | |
| 349 | |
| 350 if (c < '0' || c > '9') { | |
| 351 break; | |
| 352 } | |
| 353 } | |
| 354 | |
| 355 host = server->data; | |
| 356 host_len = server->len; | |
| 357 port = NULL; | |
| 358 port_len = 0; | |
| 359 | |
| 360 done: | |
| 361 | |
| 362 ngx_crc32_init(base_hash); | |
| 363 ngx_crc32_update(&base_hash, host, host_len); | |
| 364 ngx_crc32_update(&base_hash, (u_char *) "", 1); | |
| 365 ngx_crc32_update(&base_hash, port, port_len); | |
| 366 | |
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Upstream hash: consistency across little/big endianness.
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parents:
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diff
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367 prev_hash.value = 0; |
| 6115 | 368 npoints = peer->weight * 160; |
| 369 | |
| 370 for (j = 0; j < npoints; j++) { | |
| 371 hash = base_hash; | |
| 372 | |
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Upstream hash: consistency across little/big endianness.
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parents:
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373 ngx_crc32_update(&hash, prev_hash.byte, 4); |
| 6115 | 374 ngx_crc32_final(hash); |
| 375 | |
| 376 points->point[points->number].hash = hash; | |
| 377 points->point[points->number].server = server; | |
| 378 points->number++; | |
| 379 | |
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380 #if (NGX_HAVE_LITTLE_ENDIAN) |
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381 prev_hash.value = hash; |
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parents:
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382 #else |
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parents:
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383 prev_hash.byte[0] = (u_char) (hash & 0xff); |
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Upstream hash: consistency across little/big endianness.
Sergey Kandaurov <pluknet@nginx.com>
parents:
6121
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384 prev_hash.byte[1] = (u_char) ((hash >> 8) & 0xff); |
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Upstream hash: consistency across little/big endianness.
Sergey Kandaurov <pluknet@nginx.com>
parents:
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385 prev_hash.byte[2] = (u_char) ((hash >> 16) & 0xff); |
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Upstream hash: consistency across little/big endianness.
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parents:
6121
diff
changeset
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386 prev_hash.byte[3] = (u_char) ((hash >> 24) & 0xff); |
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bf8b6534db3a
Upstream hash: consistency across little/big endianness.
Sergey Kandaurov <pluknet@nginx.com>
parents:
6121
diff
changeset
|
387 #endif |
| 6115 | 388 } |
| 389 } | |
| 390 | |
| 391 ngx_qsort(points->point, | |
| 392 points->number, | |
| 393 sizeof(ngx_stream_upstream_chash_point_t), | |
| 394 ngx_stream_upstream_chash_cmp_points); | |
| 395 | |
| 396 for (i = 0, j = 1; j < points->number; j++) { | |
| 397 if (points->point[i].hash != points->point[j].hash) { | |
| 398 points->point[++i] = points->point[j]; | |
| 399 } | |
| 400 } | |
| 401 | |
| 402 points->number = i + 1; | |
| 403 | |
| 404 hcf = ngx_stream_conf_upstream_srv_conf(us, | |
| 405 ngx_stream_upstream_hash_module); | |
| 406 hcf->points = points; | |
| 407 | |
| 408 return NGX_OK; | |
| 409 } | |
| 410 | |
| 411 | |
| 412 static int ngx_libc_cdecl | |
| 413 ngx_stream_upstream_chash_cmp_points(const void *one, const void *two) | |
| 414 { | |
| 415 ngx_stream_upstream_chash_point_t *first = | |
| 416 (ngx_stream_upstream_chash_point_t *) one; | |
| 417 ngx_stream_upstream_chash_point_t *second = | |
| 418 (ngx_stream_upstream_chash_point_t *) two; | |
| 419 | |
| 420 if (first->hash < second->hash) { | |
| 421 return -1; | |
| 422 | |
| 423 } else if (first->hash > second->hash) { | |
| 424 return 1; | |
| 425 | |
| 426 } else { | |
| 427 return 0; | |
| 428 } | |
| 429 } | |
| 430 | |
| 431 | |
| 432 static ngx_uint_t | |
| 433 ngx_stream_upstream_find_chash_point(ngx_stream_upstream_chash_points_t *points, | |
| 434 uint32_t hash) | |
| 435 { | |
| 436 ngx_uint_t i, j, k; | |
| 437 ngx_stream_upstream_chash_point_t *point; | |
| 438 | |
| 439 /* find first point >= hash */ | |
| 440 | |
| 441 point = &points->point[0]; | |
| 442 | |
| 443 i = 0; | |
| 444 j = points->number; | |
| 445 | |
| 446 while (i < j) { | |
| 447 k = (i + j) / 2; | |
| 448 | |
| 449 if (hash > point[k].hash) { | |
| 450 i = k + 1; | |
| 451 | |
| 452 } else if (hash < point[k].hash) { | |
| 453 j = k; | |
| 454 | |
| 455 } else { | |
| 456 return k; | |
| 457 } | |
| 458 } | |
| 459 | |
| 460 return i; | |
| 461 } | |
| 462 | |
| 463 | |
| 464 static ngx_int_t | |
| 465 ngx_stream_upstream_init_chash_peer(ngx_stream_session_t *s, | |
| 466 ngx_stream_upstream_srv_conf_t *us) | |
| 467 { | |
| 468 uint32_t hash; | |
| 469 ngx_stream_upstream_hash_srv_conf_t *hcf; | |
| 470 ngx_stream_upstream_hash_peer_data_t *hp; | |
| 471 | |
| 472 if (ngx_stream_upstream_init_hash_peer(s, us) != NGX_OK) { | |
| 473 return NGX_ERROR; | |
| 474 } | |
| 475 | |
| 476 s->upstream->peer.get = ngx_stream_upstream_get_chash_peer; | |
| 477 | |
| 478 hp = s->upstream->peer.data; | |
| 479 hcf = ngx_stream_conf_upstream_srv_conf(us, | |
| 480 ngx_stream_upstream_hash_module); | |
| 481 | |
| 482 hash = ngx_crc32_long(hp->key.data, hp->key.len); | |
| 483 | |
| 484 ngx_stream_upstream_rr_peers_rlock(hp->rrp.peers); | |
| 485 | |
| 486 hp->hash = ngx_stream_upstream_find_chash_point(hcf->points, hash); | |
| 487 | |
| 488 ngx_stream_upstream_rr_peers_unlock(hp->rrp.peers); | |
| 489 | |
| 490 return NGX_OK; | |
| 491 } | |
| 492 | |
| 493 | |
| 494 static ngx_int_t | |
| 495 ngx_stream_upstream_get_chash_peer(ngx_peer_connection_t *pc, void *data) | |
| 496 { | |
| 497 ngx_stream_upstream_hash_peer_data_t *hp = data; | |
| 498 | |
| 499 time_t now; | |
| 500 intptr_t m; | |
| 501 ngx_str_t *server; | |
| 502 ngx_int_t total; | |
| 503 ngx_uint_t i, n, best_i; | |
| 504 ngx_stream_upstream_rr_peer_t *peer, *best; | |
| 505 ngx_stream_upstream_chash_point_t *point; | |
| 506 ngx_stream_upstream_chash_points_t *points; | |
| 507 ngx_stream_upstream_hash_srv_conf_t *hcf; | |
| 508 | |
| 509 ngx_log_debug1(NGX_LOG_DEBUG_STREAM, pc->log, 0, | |
| 510 "get consistent hash peer, try: %ui", pc->tries); | |
| 511 | |
| 512 ngx_stream_upstream_rr_peers_wlock(hp->rrp.peers); | |
| 513 | |
|
7513
d964b0aee8e7
Upstream hash: fall back to round-robin if hash key is empty.
Niklas Keller <me@kelunik.com>
parents:
7300
diff
changeset
|
514 if (hp->tries > 20 || hp->rrp.peers->single || hp->key.len == 0) { |
|
7123
6c52b24fcf8e
Upstream hash: limited number of tries in consistent case.
Maxim Dounin <mdounin@mdounin.ru>
parents:
6705
diff
changeset
|
515 ngx_stream_upstream_rr_peers_unlock(hp->rrp.peers); |
|
6c52b24fcf8e
Upstream hash: limited number of tries in consistent case.
Maxim Dounin <mdounin@mdounin.ru>
parents:
6705
diff
changeset
|
516 return hp->get_rr_peer(pc, &hp->rrp); |
|
6c52b24fcf8e
Upstream hash: limited number of tries in consistent case.
Maxim Dounin <mdounin@mdounin.ru>
parents:
6705
diff
changeset
|
517 } |
|
6c52b24fcf8e
Upstream hash: limited number of tries in consistent case.
Maxim Dounin <mdounin@mdounin.ru>
parents:
6705
diff
changeset
|
518 |
| 6115 | 519 pc->connection = NULL; |
| 520 | |
| 521 now = ngx_time(); | |
| 522 hcf = hp->conf; | |
| 523 | |
| 524 points = hcf->points; | |
| 525 point = &points->point[0]; | |
| 526 | |
| 527 for ( ;; ) { | |
| 528 server = point[hp->hash % points->number].server; | |
| 529 | |
| 530 ngx_log_debug2(NGX_LOG_DEBUG_STREAM, pc->log, 0, | |
| 531 "consistent hash peer:%uD, server:\"%V\"", | |
| 532 hp->hash, server); | |
| 533 | |
| 534 best = NULL; | |
| 535 best_i = 0; | |
| 536 total = 0; | |
| 537 | |
| 538 for (peer = hp->rrp.peers->peer, i = 0; | |
| 539 peer; | |
| 540 peer = peer->next, i++) | |
| 541 { | |
| 542 n = i / (8 * sizeof(uintptr_t)); | |
| 543 m = (uintptr_t) 1 << i % (8 * sizeof(uintptr_t)); | |
| 544 | |
| 545 if (hp->rrp.tried[n] & m) { | |
| 546 continue; | |
| 547 } | |
| 548 | |
| 549 if (peer->down) { | |
| 550 continue; | |
| 551 } | |
| 552 | |
| 553 if (peer->max_fails | |
| 554 && peer->fails >= peer->max_fails | |
| 555 && now - peer->checked <= peer->fail_timeout) | |
| 556 { | |
| 557 continue; | |
| 558 } | |
| 559 | |
| 6705 | 560 if (peer->max_conns && peer->conns >= peer->max_conns) { |
| 561 continue; | |
| 562 } | |
| 563 | |
|
7124
3b4fa572d56d
Upstream hash: reordered peer checks.
Maxim Dounin <mdounin@mdounin.ru>
parents:
7123
diff
changeset
|
564 if (peer->server.len != server->len |
|
3b4fa572d56d
Upstream hash: reordered peer checks.
Maxim Dounin <mdounin@mdounin.ru>
parents:
7123
diff
changeset
|
565 || ngx_strncmp(peer->server.data, server->data, server->len) |
|
3b4fa572d56d
Upstream hash: reordered peer checks.
Maxim Dounin <mdounin@mdounin.ru>
parents:
7123
diff
changeset
|
566 != 0) |
|
3b4fa572d56d
Upstream hash: reordered peer checks.
Maxim Dounin <mdounin@mdounin.ru>
parents:
7123
diff
changeset
|
567 { |
|
3b4fa572d56d
Upstream hash: reordered peer checks.
Maxim Dounin <mdounin@mdounin.ru>
parents:
7123
diff
changeset
|
568 continue; |
|
3b4fa572d56d
Upstream hash: reordered peer checks.
Maxim Dounin <mdounin@mdounin.ru>
parents:
7123
diff
changeset
|
569 } |
|
3b4fa572d56d
Upstream hash: reordered peer checks.
Maxim Dounin <mdounin@mdounin.ru>
parents:
7123
diff
changeset
|
570 |
| 6115 | 571 peer->current_weight += peer->effective_weight; |
| 572 total += peer->effective_weight; | |
| 573 | |
| 574 if (peer->effective_weight < peer->weight) { | |
| 575 peer->effective_weight++; | |
| 576 } | |
| 577 | |
| 578 if (best == NULL || peer->current_weight > best->current_weight) { | |
| 579 best = peer; | |
| 580 best_i = i; | |
| 581 } | |
| 582 } | |
| 583 | |
| 584 if (best) { | |
| 585 best->current_weight -= total; | |
| 586 break; | |
| 587 } | |
| 588 | |
| 589 hp->hash++; | |
| 590 hp->tries++; | |
| 591 | |
|
7123
6c52b24fcf8e
Upstream hash: limited number of tries in consistent case.
Maxim Dounin <mdounin@mdounin.ru>
parents:
6705
diff
changeset
|
592 if (hp->tries > 20) { |
| 6115 | 593 ngx_stream_upstream_rr_peers_unlock(hp->rrp.peers); |
|
7123
6c52b24fcf8e
Upstream hash: limited number of tries in consistent case.
Maxim Dounin <mdounin@mdounin.ru>
parents:
6705
diff
changeset
|
594 return hp->get_rr_peer(pc, &hp->rrp); |
| 6115 | 595 } |
| 596 } | |
| 597 | |
| 598 hp->rrp.current = best; | |
| 599 | |
| 600 pc->sockaddr = best->sockaddr; | |
| 601 pc->socklen = best->socklen; | |
| 602 pc->name = &best->name; | |
| 603 | |
| 604 best->conns++; | |
| 605 | |
| 606 if (now - best->checked > best->fail_timeout) { | |
| 607 best->checked = now; | |
| 608 } | |
| 609 | |
| 610 ngx_stream_upstream_rr_peers_unlock(hp->rrp.peers); | |
| 611 | |
| 612 n = best_i / (8 * sizeof(uintptr_t)); | |
| 613 m = (uintptr_t) 1 << best_i % (8 * sizeof(uintptr_t)); | |
| 614 | |
| 615 hp->rrp.tried[n] |= m; | |
| 616 | |
| 617 return NGX_OK; | |
| 618 } | |
| 619 | |
| 620 | |
| 621 static void * | |
| 622 ngx_stream_upstream_hash_create_conf(ngx_conf_t *cf) | |
| 623 { | |
| 624 ngx_stream_upstream_hash_srv_conf_t *conf; | |
| 625 | |
| 626 conf = ngx_palloc(cf->pool, sizeof(ngx_stream_upstream_hash_srv_conf_t)); | |
| 627 if (conf == NULL) { | |
| 628 return NULL; | |
| 629 } | |
| 630 | |
| 631 conf->points = NULL; | |
| 632 | |
| 633 return conf; | |
| 634 } | |
| 635 | |
| 636 | |
| 637 static char * | |
| 638 ngx_stream_upstream_hash(ngx_conf_t *cf, ngx_command_t *cmd, void *conf) | |
| 639 { | |
|
6610
d5b5866c06c4
Stream: got rid of pseudo variables.
Vladimir Homutov <vl@nginx.com>
parents:
6606
diff
changeset
|
640 ngx_stream_upstream_hash_srv_conf_t *hcf = conf; |
|
d5b5866c06c4
Stream: got rid of pseudo variables.
Vladimir Homutov <vl@nginx.com>
parents:
6606
diff
changeset
|
641 |
|
d5b5866c06c4
Stream: got rid of pseudo variables.
Vladimir Homutov <vl@nginx.com>
parents:
6606
diff
changeset
|
642 ngx_str_t *value; |
|
d5b5866c06c4
Stream: got rid of pseudo variables.
Vladimir Homutov <vl@nginx.com>
parents:
6606
diff
changeset
|
643 ngx_stream_upstream_srv_conf_t *uscf; |
|
d5b5866c06c4
Stream: got rid of pseudo variables.
Vladimir Homutov <vl@nginx.com>
parents:
6606
diff
changeset
|
644 ngx_stream_compile_complex_value_t ccv; |
| 6115 | 645 |
| 646 value = cf->args->elts; | |
| 647 | |
|
6610
d5b5866c06c4
Stream: got rid of pseudo variables.
Vladimir Homutov <vl@nginx.com>
parents:
6606
diff
changeset
|
648 ngx_memzero(&ccv, sizeof(ngx_stream_compile_complex_value_t)); |
|
d5b5866c06c4
Stream: got rid of pseudo variables.
Vladimir Homutov <vl@nginx.com>
parents:
6606
diff
changeset
|
649 |
|
d5b5866c06c4
Stream: got rid of pseudo variables.
Vladimir Homutov <vl@nginx.com>
parents:
6606
diff
changeset
|
650 ccv.cf = cf; |
|
d5b5866c06c4
Stream: got rid of pseudo variables.
Vladimir Homutov <vl@nginx.com>
parents:
6606
diff
changeset
|
651 ccv.value = &value[1]; |
|
d5b5866c06c4
Stream: got rid of pseudo variables.
Vladimir Homutov <vl@nginx.com>
parents:
6606
diff
changeset
|
652 ccv.complex_value = &hcf->key; |
|
d5b5866c06c4
Stream: got rid of pseudo variables.
Vladimir Homutov <vl@nginx.com>
parents:
6606
diff
changeset
|
653 |
|
d5b5866c06c4
Stream: got rid of pseudo variables.
Vladimir Homutov <vl@nginx.com>
parents:
6606
diff
changeset
|
654 if (ngx_stream_compile_complex_value(&ccv) != NGX_OK) { |
| 6115 | 655 return NGX_CONF_ERROR; |
| 656 } | |
| 657 | |
| 658 uscf = ngx_stream_conf_get_module_srv_conf(cf, ngx_stream_upstream_module); | |
| 659 | |
| 660 if (uscf->peer.init_upstream) { | |
| 661 ngx_conf_log_error(NGX_LOG_WARN, cf, 0, | |
| 662 "load balancing method redefined"); | |
| 663 } | |
| 664 | |
| 665 uscf->flags = NGX_STREAM_UPSTREAM_CREATE | |
| 666 |NGX_STREAM_UPSTREAM_WEIGHT | |
| 6705 | 667 |NGX_STREAM_UPSTREAM_MAX_CONNS |
| 6115 | 668 |NGX_STREAM_UPSTREAM_MAX_FAILS |
| 669 |NGX_STREAM_UPSTREAM_FAIL_TIMEOUT | |
| 670 |NGX_STREAM_UPSTREAM_DOWN; | |
| 671 | |
| 672 if (cf->args->nelts == 2) { | |
| 673 uscf->peer.init_upstream = ngx_stream_upstream_init_hash; | |
| 674 | |
| 675 } else if (ngx_strcmp(value[2].data, "consistent") == 0) { | |
| 676 uscf->peer.init_upstream = ngx_stream_upstream_init_chash; | |
| 677 | |
| 678 } else { | |
| 679 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, | |
| 680 "invalid parameter \"%V\"", &value[2]); | |
| 681 return NGX_CONF_ERROR; | |
| 682 } | |
| 683 | |
| 684 return NGX_CONF_OK; | |
| 685 } |