Mercurial > hg > nginx
annotate src/http/modules/ngx_http_upstream_least_conn_module.c @ 7598:d13eddd9e252
release-1.17.6 tag
author | Maxim Dounin <mdounin@mdounin.ru> |
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date | Tue, 19 Nov 2019 17:18:58 +0300 |
parents | 29bf0dbc0a77 |
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1 |
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2 /* |
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3 * Copyright (C) Maxim Dounin |
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4 * Copyright (C) Nginx, Inc. |
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5 */ |
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6 |
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7 |
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8 #include <ngx_config.h> |
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9 #include <ngx_core.h> |
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10 #include <ngx_http.h> |
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11 |
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12 |
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13 static ngx_int_t ngx_http_upstream_init_least_conn_peer(ngx_http_request_t *r, |
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14 ngx_http_upstream_srv_conf_t *us); |
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15 static ngx_int_t ngx_http_upstream_get_least_conn_peer( |
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16 ngx_peer_connection_t *pc, void *data); |
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17 static char *ngx_http_upstream_least_conn(ngx_conf_t *cf, ngx_command_t *cmd, |
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18 void *conf); |
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19 |
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20 |
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21 static ngx_command_t ngx_http_upstream_least_conn_commands[] = { |
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22 |
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23 { ngx_string("least_conn"), |
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24 NGX_HTTP_UPS_CONF|NGX_CONF_NOARGS, |
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25 ngx_http_upstream_least_conn, |
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26 0, |
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27 0, |
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28 NULL }, |
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29 |
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30 ngx_null_command |
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31 }; |
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32 |
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33 |
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34 static ngx_http_module_t ngx_http_upstream_least_conn_module_ctx = { |
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35 NULL, /* preconfiguration */ |
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36 NULL, /* postconfiguration */ |
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37 |
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38 NULL, /* create main configuration */ |
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39 NULL, /* init main configuration */ |
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40 |
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41 NULL, /* create server configuration */ |
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42 NULL, /* merge server configuration */ |
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43 |
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44 NULL, /* create location configuration */ |
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45 NULL /* merge location configuration */ |
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46 }; |
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47 |
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48 |
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49 ngx_module_t ngx_http_upstream_least_conn_module = { |
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50 NGX_MODULE_V1, |
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51 &ngx_http_upstream_least_conn_module_ctx, /* module context */ |
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52 ngx_http_upstream_least_conn_commands, /* module directives */ |
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53 NGX_HTTP_MODULE, /* module type */ |
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54 NULL, /* init master */ |
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55 NULL, /* init module */ |
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56 NULL, /* init process */ |
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57 NULL, /* init thread */ |
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58 NULL, /* exit thread */ |
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59 NULL, /* exit process */ |
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60 NULL, /* exit master */ |
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61 NGX_MODULE_V1_PADDING |
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62 }; |
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63 |
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64 |
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65 static ngx_int_t |
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66 ngx_http_upstream_init_least_conn(ngx_conf_t *cf, |
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67 ngx_http_upstream_srv_conf_t *us) |
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68 { |
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69 ngx_log_debug0(NGX_LOG_DEBUG_HTTP, cf->log, 0, |
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70 "init least conn"); |
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71 |
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72 if (ngx_http_upstream_init_round_robin(cf, us) != NGX_OK) { |
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73 return NGX_ERROR; |
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74 } |
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75 |
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76 us->peer.init = ngx_http_upstream_init_least_conn_peer; |
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77 |
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78 return NGX_OK; |
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79 } |
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80 |
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81 |
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82 static ngx_int_t |
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83 ngx_http_upstream_init_least_conn_peer(ngx_http_request_t *r, |
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84 ngx_http_upstream_srv_conf_t *us) |
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85 { |
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86 ngx_log_debug0(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, |
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87 "init least conn peer"); |
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88 |
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89 if (ngx_http_upstream_init_round_robin_peer(r, us) != NGX_OK) { |
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90 return NGX_ERROR; |
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91 } |
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92 |
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93 r->upstream->peer.get = ngx_http_upstream_get_least_conn_peer; |
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94 |
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95 return NGX_OK; |
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96 } |
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97 |
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98 |
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99 static ngx_int_t |
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100 ngx_http_upstream_get_least_conn_peer(ngx_peer_connection_t *pc, void *data) |
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101 { |
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102 ngx_http_upstream_rr_peer_data_t *rrp = data; |
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103 |
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104 time_t now; |
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105 uintptr_t m; |
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106 ngx_int_t rc, total; |
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107 ngx_uint_t i, n, p, many; |
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108 ngx_http_upstream_rr_peer_t *peer, *best; |
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109 ngx_http_upstream_rr_peers_t *peers; |
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110 |
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111 ngx_log_debug1(NGX_LOG_DEBUG_HTTP, pc->log, 0, |
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112 "get least conn peer, try: %ui", pc->tries); |
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113 |
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114 if (rrp->peers->single) { |
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115 return ngx_http_upstream_get_round_robin_peer(pc, rrp); |
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116 } |
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117 |
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118 pc->cached = 0; |
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119 pc->connection = NULL; |
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120 |
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121 now = ngx_time(); |
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Upstream: least_conn balancer module.
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|
122 |
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Upstream: track the number of active connections to upstreams.
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parents:
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|
123 peers = rrp->peers; |
4654
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Upstream: least_conn balancer module.
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parents:
diff
changeset
|
124 |
6102 | 125 ngx_http_upstream_rr_peers_wlock(peers); |
126 | |
4654
a2ca3a6ee680
Upstream: least_conn balancer module.
Maxim Dounin <mdounin@mdounin.ru>
parents:
diff
changeset
|
127 best = NULL; |
a2ca3a6ee680
Upstream: least_conn balancer module.
Maxim Dounin <mdounin@mdounin.ru>
parents:
diff
changeset
|
128 total = 0; |
a2ca3a6ee680
Upstream: least_conn balancer module.
Maxim Dounin <mdounin@mdounin.ru>
parents:
diff
changeset
|
129 |
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Upstream: least_conn balancer module.
Maxim Dounin <mdounin@mdounin.ru>
parents:
diff
changeset
|
130 #if (NGX_SUPPRESS_WARN) |
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Upstream: least_conn balancer module.
Maxim Dounin <mdounin@mdounin.ru>
parents:
diff
changeset
|
131 many = 0; |
a2ca3a6ee680
Upstream: least_conn balancer module.
Maxim Dounin <mdounin@mdounin.ru>
parents:
diff
changeset
|
132 p = 0; |
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Upstream: least_conn balancer module.
Maxim Dounin <mdounin@mdounin.ru>
parents:
diff
changeset
|
133 #endif |
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Upstream: least_conn balancer module.
Maxim Dounin <mdounin@mdounin.ru>
parents:
diff
changeset
|
134 |
6100
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Upstream: store peers as a linked list.
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|
135 for (peer = peers->peer, i = 0; |
c44459611d91
Upstream: store peers as a linked list.
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diff
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|
136 peer; |
c44459611d91
Upstream: store peers as a linked list.
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parents:
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diff
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|
137 peer = peer->next, i++) |
c44459611d91
Upstream: store peers as a linked list.
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diff
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|
138 { |
4654
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Upstream: least_conn balancer module.
Maxim Dounin <mdounin@mdounin.ru>
parents:
diff
changeset
|
139 n = i / (8 * sizeof(uintptr_t)); |
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Upstream: least_conn balancer module.
Maxim Dounin <mdounin@mdounin.ru>
parents:
diff
changeset
|
140 m = (uintptr_t) 1 << i % (8 * sizeof(uintptr_t)); |
a2ca3a6ee680
Upstream: least_conn balancer module.
Maxim Dounin <mdounin@mdounin.ru>
parents:
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changeset
|
141 |
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Upstream: track the number of active connections to upstreams.
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|
142 if (rrp->tried[n] & m) { |
4654
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Upstream: least_conn balancer module.
Maxim Dounin <mdounin@mdounin.ru>
parents:
diff
changeset
|
143 continue; |
a2ca3a6ee680
Upstream: least_conn balancer module.
Maxim Dounin <mdounin@mdounin.ru>
parents:
diff
changeset
|
144 } |
a2ca3a6ee680
Upstream: least_conn balancer module.
Maxim Dounin <mdounin@mdounin.ru>
parents:
diff
changeset
|
145 |
a2ca3a6ee680
Upstream: least_conn balancer module.
Maxim Dounin <mdounin@mdounin.ru>
parents:
diff
changeset
|
146 if (peer->down) { |
a2ca3a6ee680
Upstream: least_conn balancer module.
Maxim Dounin <mdounin@mdounin.ru>
parents:
diff
changeset
|
147 continue; |
a2ca3a6ee680
Upstream: least_conn balancer module.
Maxim Dounin <mdounin@mdounin.ru>
parents:
diff
changeset
|
148 } |
a2ca3a6ee680
Upstream: least_conn balancer module.
Maxim Dounin <mdounin@mdounin.ru>
parents:
diff
changeset
|
149 |
a2ca3a6ee680
Upstream: least_conn balancer module.
Maxim Dounin <mdounin@mdounin.ru>
parents:
diff
changeset
|
150 if (peer->max_fails |
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Upstream: least_conn balancer module.
Maxim Dounin <mdounin@mdounin.ru>
parents:
diff
changeset
|
151 && peer->fails >= peer->max_fails |
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Upstream: least_conn balancer module.
Maxim Dounin <mdounin@mdounin.ru>
parents:
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changeset
|
152 && now - peer->checked <= peer->fail_timeout) |
a2ca3a6ee680
Upstream: least_conn balancer module.
Maxim Dounin <mdounin@mdounin.ru>
parents:
diff
changeset
|
153 { |
a2ca3a6ee680
Upstream: least_conn balancer module.
Maxim Dounin <mdounin@mdounin.ru>
parents:
diff
changeset
|
154 continue; |
a2ca3a6ee680
Upstream: least_conn balancer module.
Maxim Dounin <mdounin@mdounin.ru>
parents:
diff
changeset
|
155 } |
a2ca3a6ee680
Upstream: least_conn balancer module.
Maxim Dounin <mdounin@mdounin.ru>
parents:
diff
changeset
|
156 |
6705 | 157 if (peer->max_conns && peer->conns >= peer->max_conns) { |
158 continue; | |
159 } | |
160 | |
4654
a2ca3a6ee680
Upstream: least_conn balancer module.
Maxim Dounin <mdounin@mdounin.ru>
parents:
diff
changeset
|
161 /* |
a2ca3a6ee680
Upstream: least_conn balancer module.
Maxim Dounin <mdounin@mdounin.ru>
parents:
diff
changeset
|
162 * select peer with least number of connections; if there are |
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Upstream: least_conn balancer module.
Maxim Dounin <mdounin@mdounin.ru>
parents:
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changeset
|
163 * multiple peers with the same number of connections, select |
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Upstream: least_conn balancer module.
Maxim Dounin <mdounin@mdounin.ru>
parents:
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changeset
|
164 * based on round-robin |
a2ca3a6ee680
Upstream: least_conn balancer module.
Maxim Dounin <mdounin@mdounin.ru>
parents:
diff
changeset
|
165 */ |
a2ca3a6ee680
Upstream: least_conn balancer module.
Maxim Dounin <mdounin@mdounin.ru>
parents:
diff
changeset
|
166 |
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Upstream: least_conn balancer module.
Maxim Dounin <mdounin@mdounin.ru>
parents:
diff
changeset
|
167 if (best == NULL |
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Upstream: track the number of active connections to upstreams.
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|
168 || peer->conns * best->weight < best->conns * peer->weight) |
4654
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Upstream: least_conn balancer module.
Maxim Dounin <mdounin@mdounin.ru>
parents:
diff
changeset
|
169 { |
a2ca3a6ee680
Upstream: least_conn balancer module.
Maxim Dounin <mdounin@mdounin.ru>
parents:
diff
changeset
|
170 best = peer; |
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Upstream: least_conn balancer module.
Maxim Dounin <mdounin@mdounin.ru>
parents:
diff
changeset
|
171 many = 0; |
a2ca3a6ee680
Upstream: least_conn balancer module.
Maxim Dounin <mdounin@mdounin.ru>
parents:
diff
changeset
|
172 p = i; |
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Upstream: least_conn balancer module.
Maxim Dounin <mdounin@mdounin.ru>
parents:
diff
changeset
|
173 |
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Upstream: track the number of active connections to upstreams.
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parents:
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|
174 } else if (peer->conns * best->weight == best->conns * peer->weight) { |
4654
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Upstream: least_conn balancer module.
Maxim Dounin <mdounin@mdounin.ru>
parents:
diff
changeset
|
175 many = 1; |
a2ca3a6ee680
Upstream: least_conn balancer module.
Maxim Dounin <mdounin@mdounin.ru>
parents:
diff
changeset
|
176 } |
a2ca3a6ee680
Upstream: least_conn balancer module.
Maxim Dounin <mdounin@mdounin.ru>
parents:
diff
changeset
|
177 } |
a2ca3a6ee680
Upstream: least_conn balancer module.
Maxim Dounin <mdounin@mdounin.ru>
parents:
diff
changeset
|
178 |
a2ca3a6ee680
Upstream: least_conn balancer module.
Maxim Dounin <mdounin@mdounin.ru>
parents:
diff
changeset
|
179 if (best == NULL) { |
a2ca3a6ee680
Upstream: least_conn balancer module.
Maxim Dounin <mdounin@mdounin.ru>
parents:
diff
changeset
|
180 ngx_log_debug0(NGX_LOG_DEBUG_HTTP, pc->log, 0, |
a2ca3a6ee680
Upstream: least_conn balancer module.
Maxim Dounin <mdounin@mdounin.ru>
parents:
diff
changeset
|
181 "get least conn peer, no peer found"); |
a2ca3a6ee680
Upstream: least_conn balancer module.
Maxim Dounin <mdounin@mdounin.ru>
parents:
diff
changeset
|
182 |
a2ca3a6ee680
Upstream: least_conn balancer module.
Maxim Dounin <mdounin@mdounin.ru>
parents:
diff
changeset
|
183 goto failed; |
a2ca3a6ee680
Upstream: least_conn balancer module.
Maxim Dounin <mdounin@mdounin.ru>
parents:
diff
changeset
|
184 } |
a2ca3a6ee680
Upstream: least_conn balancer module.
Maxim Dounin <mdounin@mdounin.ru>
parents:
diff
changeset
|
185 |
a2ca3a6ee680
Upstream: least_conn balancer module.
Maxim Dounin <mdounin@mdounin.ru>
parents:
diff
changeset
|
186 if (many) { |
a2ca3a6ee680
Upstream: least_conn balancer module.
Maxim Dounin <mdounin@mdounin.ru>
parents:
diff
changeset
|
187 ngx_log_debug0(NGX_LOG_DEBUG_HTTP, pc->log, 0, |
a2ca3a6ee680
Upstream: least_conn balancer module.
Maxim Dounin <mdounin@mdounin.ru>
parents:
diff
changeset
|
188 "get least conn peer, many"); |
a2ca3a6ee680
Upstream: least_conn balancer module.
Maxim Dounin <mdounin@mdounin.ru>
parents:
diff
changeset
|
189 |
6100
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Upstream: store peers as a linked list.
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parents:
6099
diff
changeset
|
190 for (peer = best, i = p; |
c44459611d91
Upstream: store peers as a linked list.
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parents:
6099
diff
changeset
|
191 peer; |
c44459611d91
Upstream: store peers as a linked list.
Ruslan Ermilov <ru@nginx.com>
parents:
6099
diff
changeset
|
192 peer = peer->next, i++) |
c44459611d91
Upstream: store peers as a linked list.
Ruslan Ermilov <ru@nginx.com>
parents:
6099
diff
changeset
|
193 { |
4654
a2ca3a6ee680
Upstream: least_conn balancer module.
Maxim Dounin <mdounin@mdounin.ru>
parents:
diff
changeset
|
194 n = i / (8 * sizeof(uintptr_t)); |
a2ca3a6ee680
Upstream: least_conn balancer module.
Maxim Dounin <mdounin@mdounin.ru>
parents:
diff
changeset
|
195 m = (uintptr_t) 1 << i % (8 * sizeof(uintptr_t)); |
a2ca3a6ee680
Upstream: least_conn balancer module.
Maxim Dounin <mdounin@mdounin.ru>
parents:
diff
changeset
|
196 |
6099
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Upstream: track the number of active connections to upstreams.
Ruslan Ermilov <ru@nginx.com>
parents:
5831
diff
changeset
|
197 if (rrp->tried[n] & m) { |
4654
a2ca3a6ee680
Upstream: least_conn balancer module.
Maxim Dounin <mdounin@mdounin.ru>
parents:
diff
changeset
|
198 continue; |
a2ca3a6ee680
Upstream: least_conn balancer module.
Maxim Dounin <mdounin@mdounin.ru>
parents:
diff
changeset
|
199 } |
a2ca3a6ee680
Upstream: least_conn balancer module.
Maxim Dounin <mdounin@mdounin.ru>
parents:
diff
changeset
|
200 |
a2ca3a6ee680
Upstream: least_conn balancer module.
Maxim Dounin <mdounin@mdounin.ru>
parents:
diff
changeset
|
201 if (peer->down) { |
a2ca3a6ee680
Upstream: least_conn balancer module.
Maxim Dounin <mdounin@mdounin.ru>
parents:
diff
changeset
|
202 continue; |
a2ca3a6ee680
Upstream: least_conn balancer module.
Maxim Dounin <mdounin@mdounin.ru>
parents:
diff
changeset
|
203 } |
a2ca3a6ee680
Upstream: least_conn balancer module.
Maxim Dounin <mdounin@mdounin.ru>
parents:
diff
changeset
|
204 |
6099
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Upstream: track the number of active connections to upstreams.
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parents:
5831
diff
changeset
|
205 if (peer->conns * best->weight != best->conns * peer->weight) { |
4654
a2ca3a6ee680
Upstream: least_conn balancer module.
Maxim Dounin <mdounin@mdounin.ru>
parents:
diff
changeset
|
206 continue; |
a2ca3a6ee680
Upstream: least_conn balancer module.
Maxim Dounin <mdounin@mdounin.ru>
parents:
diff
changeset
|
207 } |
a2ca3a6ee680
Upstream: least_conn balancer module.
Maxim Dounin <mdounin@mdounin.ru>
parents:
diff
changeset
|
208 |
a2ca3a6ee680
Upstream: least_conn balancer module.
Maxim Dounin <mdounin@mdounin.ru>
parents:
diff
changeset
|
209 if (peer->max_fails |
a2ca3a6ee680
Upstream: least_conn balancer module.
Maxim Dounin <mdounin@mdounin.ru>
parents:
diff
changeset
|
210 && peer->fails >= peer->max_fails |
a2ca3a6ee680
Upstream: least_conn balancer module.
Maxim Dounin <mdounin@mdounin.ru>
parents:
diff
changeset
|
211 && now - peer->checked <= peer->fail_timeout) |
a2ca3a6ee680
Upstream: least_conn balancer module.
Maxim Dounin <mdounin@mdounin.ru>
parents:
diff
changeset
|
212 { |
a2ca3a6ee680
Upstream: least_conn balancer module.
Maxim Dounin <mdounin@mdounin.ru>
parents:
diff
changeset
|
213 continue; |
a2ca3a6ee680
Upstream: least_conn balancer module.
Maxim Dounin <mdounin@mdounin.ru>
parents:
diff
changeset
|
214 } |
a2ca3a6ee680
Upstream: least_conn balancer module.
Maxim Dounin <mdounin@mdounin.ru>
parents:
diff
changeset
|
215 |
6705 | 216 if (peer->max_conns && peer->conns >= peer->max_conns) { |
217 continue; | |
218 } | |
219 | |
4654
a2ca3a6ee680
Upstream: least_conn balancer module.
Maxim Dounin <mdounin@mdounin.ru>
parents:
diff
changeset
|
220 peer->current_weight += peer->effective_weight; |
a2ca3a6ee680
Upstream: least_conn balancer module.
Maxim Dounin <mdounin@mdounin.ru>
parents:
diff
changeset
|
221 total += peer->effective_weight; |
a2ca3a6ee680
Upstream: least_conn balancer module.
Maxim Dounin <mdounin@mdounin.ru>
parents:
diff
changeset
|
222 |
a2ca3a6ee680
Upstream: least_conn balancer module.
Maxim Dounin <mdounin@mdounin.ru>
parents:
diff
changeset
|
223 if (peer->effective_weight < peer->weight) { |
a2ca3a6ee680
Upstream: least_conn balancer module.
Maxim Dounin <mdounin@mdounin.ru>
parents:
diff
changeset
|
224 peer->effective_weight++; |
a2ca3a6ee680
Upstream: least_conn balancer module.
Maxim Dounin <mdounin@mdounin.ru>
parents:
diff
changeset
|
225 } |
a2ca3a6ee680
Upstream: least_conn balancer module.
Maxim Dounin <mdounin@mdounin.ru>
parents:
diff
changeset
|
226 |
a2ca3a6ee680
Upstream: least_conn balancer module.
Maxim Dounin <mdounin@mdounin.ru>
parents:
diff
changeset
|
227 if (peer->current_weight > best->current_weight) { |
a2ca3a6ee680
Upstream: least_conn balancer module.
Maxim Dounin <mdounin@mdounin.ru>
parents:
diff
changeset
|
228 best = peer; |
a2ca3a6ee680
Upstream: least_conn balancer module.
Maxim Dounin <mdounin@mdounin.ru>
parents:
diff
changeset
|
229 p = i; |
a2ca3a6ee680
Upstream: least_conn balancer module.
Maxim Dounin <mdounin@mdounin.ru>
parents:
diff
changeset
|
230 } |
a2ca3a6ee680
Upstream: least_conn balancer module.
Maxim Dounin <mdounin@mdounin.ru>
parents:
diff
changeset
|
231 } |
a2ca3a6ee680
Upstream: least_conn balancer module.
Maxim Dounin <mdounin@mdounin.ru>
parents:
diff
changeset
|
232 } |
a2ca3a6ee680
Upstream: least_conn balancer module.
Maxim Dounin <mdounin@mdounin.ru>
parents:
diff
changeset
|
233 |
a2ca3a6ee680
Upstream: least_conn balancer module.
Maxim Dounin <mdounin@mdounin.ru>
parents:
diff
changeset
|
234 best->current_weight -= total; |
5220
1d68b502088c
Upstream: fixed fail_timeout and max_fails > 1.
Maxim Dounin <mdounin@mdounin.ru>
parents:
5173
diff
changeset
|
235 |
1d68b502088c
Upstream: fixed fail_timeout and max_fails > 1.
Maxim Dounin <mdounin@mdounin.ru>
parents:
5173
diff
changeset
|
236 if (now - best->checked > best->fail_timeout) { |
1d68b502088c
Upstream: fixed fail_timeout and max_fails > 1.
Maxim Dounin <mdounin@mdounin.ru>
parents:
5173
diff
changeset
|
237 best->checked = now; |
1d68b502088c
Upstream: fixed fail_timeout and max_fails > 1.
Maxim Dounin <mdounin@mdounin.ru>
parents:
5173
diff
changeset
|
238 } |
4654
a2ca3a6ee680
Upstream: least_conn balancer module.
Maxim Dounin <mdounin@mdounin.ru>
parents:
diff
changeset
|
239 |
a2ca3a6ee680
Upstream: least_conn balancer module.
Maxim Dounin <mdounin@mdounin.ru>
parents:
diff
changeset
|
240 pc->sockaddr = best->sockaddr; |
a2ca3a6ee680
Upstream: least_conn balancer module.
Maxim Dounin <mdounin@mdounin.ru>
parents:
diff
changeset
|
241 pc->socklen = best->socklen; |
a2ca3a6ee680
Upstream: least_conn balancer module.
Maxim Dounin <mdounin@mdounin.ru>
parents:
diff
changeset
|
242 pc->name = &best->name; |
a2ca3a6ee680
Upstream: least_conn balancer module.
Maxim Dounin <mdounin@mdounin.ru>
parents:
diff
changeset
|
243 |
6099
6ff0ebd6fbf4
Upstream: track the number of active connections to upstreams.
Ruslan Ermilov <ru@nginx.com>
parents:
5831
diff
changeset
|
244 best->conns++; |
6ff0ebd6fbf4
Upstream: track the number of active connections to upstreams.
Ruslan Ermilov <ru@nginx.com>
parents:
5831
diff
changeset
|
245 |
6100
c44459611d91
Upstream: store peers as a linked list.
Ruslan Ermilov <ru@nginx.com>
parents:
6099
diff
changeset
|
246 rrp->current = best; |
4654
a2ca3a6ee680
Upstream: least_conn balancer module.
Maxim Dounin <mdounin@mdounin.ru>
parents:
diff
changeset
|
247 |
a2ca3a6ee680
Upstream: least_conn balancer module.
Maxim Dounin <mdounin@mdounin.ru>
parents:
diff
changeset
|
248 n = p / (8 * sizeof(uintptr_t)); |
a2ca3a6ee680
Upstream: least_conn balancer module.
Maxim Dounin <mdounin@mdounin.ru>
parents:
diff
changeset
|
249 m = (uintptr_t) 1 << p % (8 * sizeof(uintptr_t)); |
a2ca3a6ee680
Upstream: least_conn balancer module.
Maxim Dounin <mdounin@mdounin.ru>
parents:
diff
changeset
|
250 |
6099
6ff0ebd6fbf4
Upstream: track the number of active connections to upstreams.
Ruslan Ermilov <ru@nginx.com>
parents:
5831
diff
changeset
|
251 rrp->tried[n] |= m; |
4654
a2ca3a6ee680
Upstream: least_conn balancer module.
Maxim Dounin <mdounin@mdounin.ru>
parents:
diff
changeset
|
252 |
6102 | 253 ngx_http_upstream_rr_peers_unlock(peers); |
254 | |
4654
a2ca3a6ee680
Upstream: least_conn balancer module.
Maxim Dounin <mdounin@mdounin.ru>
parents:
diff
changeset
|
255 return NGX_OK; |
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256 |
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257 failed: |
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258 |
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259 if (peers->next) { |
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260 ngx_log_debug0(NGX_LOG_DEBUG_HTTP, pc->log, 0, |
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261 "get least conn peer, backup servers"); |
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262 |
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263 rrp->peers = peers->next; |
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264 |
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265 n = (rrp->peers->number + (8 * sizeof(uintptr_t) - 1)) |
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266 / (8 * sizeof(uintptr_t)); |
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267 |
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268 for (i = 0; i < n; i++) { |
6474 | 269 rrp->tried[i] = 0; |
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270 } |
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271 |
6102 | 272 ngx_http_upstream_rr_peers_unlock(peers); |
273 | |
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274 rc = ngx_http_upstream_get_least_conn_peer(pc, rrp); |
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275 |
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276 if (rc != NGX_BUSY) { |
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277 return rc; |
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278 } |
6102 | 279 |
280 ngx_http_upstream_rr_peers_wlock(peers); | |
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281 } |
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282 |
6102 | 283 ngx_http_upstream_rr_peers_unlock(peers); |
284 | |
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285 pc->name = peers->name; |
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286 |
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287 return NGX_BUSY; |
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288 } |
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289 |
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290 |
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291 static char * |
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292 ngx_http_upstream_least_conn(ngx_conf_t *cf, ngx_command_t *cmd, void *conf) |
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293 { |
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294 ngx_http_upstream_srv_conf_t *uscf; |
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295 |
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296 uscf = ngx_http_conf_get_module_srv_conf(cf, ngx_http_upstream_module); |
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297 |
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298 if (uscf->peer.init_upstream) { |
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299 ngx_conf_log_error(NGX_LOG_WARN, cf, 0, |
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300 "load balancing method redefined"); |
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301 } |
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302 |
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303 uscf->peer.init_upstream = ngx_http_upstream_init_least_conn; |
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304 |
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305 uscf->flags = NGX_HTTP_UPSTREAM_CREATE |
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306 |NGX_HTTP_UPSTREAM_WEIGHT |
6705 | 307 |NGX_HTTP_UPSTREAM_MAX_CONNS |
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308 |NGX_HTTP_UPSTREAM_MAX_FAILS |
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309 |NGX_HTTP_UPSTREAM_FAIL_TIMEOUT |
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310 |NGX_HTTP_UPSTREAM_DOWN |
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311 |NGX_HTTP_UPSTREAM_BACKUP; |
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312 |
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313 return NGX_CONF_OK; |
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314 } |