Mercurial > hg > nginx-quic
annotate src/core/ngx_connection.h @ 4207:4fc91bae6f83
Better recheck of dead upstream servers.
Previously nginx used to mark backend again as live as soon as fail_timeout
passes (10s by default) since last failure. On the other hand, detecting
dead backend takes up to 60s (proxy_connect_timeout) in typical situation
"backend is down and doesn't respond to any packets". This resulted in
suboptimal behaviour in the above situation (up to 23% of requests were
directed to dead backend with default settings).
More detailed description of the problem may be found here (in Russian):
http://mailman.nginx.org/pipermail/nginx-ru/2011-August/042172.html
Fix is to only allow one request after fail_timeout passes, and
mark backend as "live" only if this request succeeds.
Note that with new code backend will not be marked "live" unless "check"
request is completed, and this may take a while in some specific workloads
(e.g. streaming). This is believed to be acceptable.
author | Maxim Dounin <mdounin@mdounin.ru> |
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date | Wed, 12 Oct 2011 14:22:48 +0000 |
parents | e3cb8e27e413 |
children | c4513d4dd024 4919fb357a5d |
rev | line source |
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2 /* |
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3 * Copyright (C) Igor Sysoev |
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4 */ |
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7 #ifndef _NGX_CONNECTION_H_INCLUDED_ |
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8 #define _NGX_CONNECTION_H_INCLUDED_ |
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11 #include <ngx_config.h> |
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12 #include <ngx_core.h> |
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13 |
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14 |
543 | 15 typedef struct ngx_listening_s ngx_listening_t; |
16 | |
17 struct ngx_listening_s { | |
18 ngx_socket_t fd; | |
103
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19 |
543 | 20 struct sockaddr *sockaddr; |
21 socklen_t socklen; /* size of sockaddr */ | |
22 size_t addr_text_max_len; | |
23 ngx_str_t addr_text; | |
103
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24 |
543 | 25 int type; |
563 | 26 |
543 | 27 int backlog; |
563 | 28 int rcvbuf; |
29 int sndbuf; | |
103
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30 |
543 | 31 /* handler of accepted connection */ |
547 | 32 ngx_connection_handler_pt handler; |
543 | 33 |
34 void *servers; /* array of ngx_http_in_addr_t, for example */ | |
103
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35 |
543 | 36 ngx_log_t log; |
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37 ngx_log_t *logp; |
103
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38 |
543 | 39 size_t pool_size; |
40 /* should be here because of the AcceptEx() preread */ | |
41 size_t post_accept_buffer_size; | |
42 /* should be here because of the deferred accept */ | |
557 | 43 ngx_msec_t post_accept_timeout; |
543 | 44 |
45 ngx_listening_t *previous; | |
46 ngx_connection_t *connection; | |
103
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47 |
543 | 48 unsigned open:1; |
49 unsigned remain:1; | |
50 unsigned ignore:1; | |
109
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51 |
543 | 52 unsigned bound:1; /* already bound */ |
53 unsigned inherited:1; /* inherited from previous process */ | |
54 unsigned nonblocking_accept:1; | |
563 | 55 unsigned listen:1; |
543 | 56 unsigned nonblocking:1; |
57 unsigned shared:1; /* shared between threads or processes */ | |
58 unsigned addr_ntop:1; | |
523 | 59 |
2562 | 60 #if (NGX_HAVE_INET6 && defined IPV6_V6ONLY) |
61 unsigned ipv6only:2; | |
62 #endif | |
63 | |
469 | 64 #if (NGX_HAVE_DEFERRED_ACCEPT) |
543 | 65 unsigned deferred_accept:1; |
66 unsigned delete_deferred:1; | |
67 unsigned add_deferred:1; | |
523 | 68 #ifdef SO_ACCEPTFILTER |
543 | 69 char *accept_filter; |
523 | 70 #endif |
103
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71 #endif |
3676 | 72 #if (NGX_HAVE_SETFIB) |
73 int setfib; | |
74 #endif | |
419
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75 |
543 | 76 }; |
92
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77 |
0
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78 |
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79 typedef enum { |
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80 NGX_ERROR_ALERT = 0, |
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81 NGX_ERROR_ERR, |
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82 NGX_ERROR_INFO, |
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83 NGX_ERROR_IGNORE_ECONNRESET, |
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84 NGX_ERROR_IGNORE_EINVAL |
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85 } ngx_connection_log_error_e; |
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86 |
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87 |
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88 typedef enum { |
483 | 89 NGX_TCP_NODELAY_UNSET = 0, |
90 NGX_TCP_NODELAY_SET, | |
91 NGX_TCP_NODELAY_DISABLED | |
92 } ngx_connection_tcp_nodelay_e; | |
93 | |
94 | |
95 typedef enum { | |
344
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96 NGX_TCP_NOPUSH_UNSET = 0, |
483 | 97 NGX_TCP_NOPUSH_SET, |
98 NGX_TCP_NOPUSH_DISABLED | |
344
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99 } ngx_connection_tcp_nopush_e; |
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100 |
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101 |
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102 #define NGX_LOWLEVEL_BUFFERED 0x0f |
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103 #define NGX_SSL_BUFFERED 0x01 |
597 | 104 |
105 | |
0
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106 struct ngx_connection_s { |
396
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107 void *data; |
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108 ngx_event_t *read; |
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109 ngx_event_t *write; |
103
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110 |
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111 ngx_socket_t fd; |
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112 |
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113 ngx_recv_pt recv; |
539 | 114 ngx_send_pt send; |
577 | 115 ngx_recv_chain_pt recv_chain; |
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116 ngx_send_chain_pt send_chain; |
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117 |
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118 ngx_listening_t *listening; |
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119 |
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120 off_t sent; |
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121 |
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122 ngx_log_t *log; |
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123 |
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124 ngx_pool_t *pool; |
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125 |
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126 struct sockaddr *sockaddr; |
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127 socklen_t socklen; |
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128 ngx_str_t addr_text; |
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129 |
577 | 130 #if (NGX_SSL) |
547 | 131 ngx_ssl_connection_t *ssl; |
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132 #endif |
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133 |
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134 struct sockaddr *local_sockaddr; |
103
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135 |
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136 ngx_buf_t *buffer; |
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137 |
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138 ngx_queue_t queue; |
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139 |
495 | 140 ngx_atomic_uint_t number; |
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141 |
2888 | 142 ngx_uint_t requests; |
143 | |
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144 unsigned buffered:8; |
597 | 145 |
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146 unsigned log_error:3; /* ngx_connection_log_error_e */ |
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147 |
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148 unsigned single_connection:1; |
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149 unsigned unexpected_eof:1; |
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150 unsigned timedout:1; |
583 | 151 unsigned error:1; |
152 unsigned destroyed:1; | |
452 | 153 |
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154 unsigned idle:1; |
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155 unsigned reusable:1; |
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156 unsigned close:1; |
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157 |
452 | 158 unsigned sendfile:1; |
159 unsigned sndlowat:1; | |
483 | 160 unsigned tcp_nodelay:2; /* ngx_connection_tcp_nodelay_e */ |
161 unsigned tcp_nopush:2; /* ngx_connection_tcp_nopush_e */ | |
452 | 162 |
469 | 163 #if (NGX_HAVE_IOCP) |
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164 unsigned accept_context_updated:1; |
103
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165 #endif |
370
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166 |
3065 | 167 #if (NGX_HAVE_AIO_SENDFILE) |
168 unsigned aio_sendfile:1; | |
169 ngx_buf_t *busy_sendfile; | |
170 #endif | |
171 | |
370
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172 #if (NGX_THREADS) |
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Igor Sysoev <igor@sysoev.ru>
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393
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173 ngx_atomic_t lock; |
370
54f76b0b8dca
nginx-0.0.7-2004-06-27-22:01:57 import
Igor Sysoev <igor@sysoev.ru>
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356
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174 #endif |
0
4eff17414a43
nginx-0.0.1-2002-08-06-20:39:45 import
Igor Sysoev <igor@sysoev.ru>
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175 }; |
4eff17414a43
nginx-0.0.1-2002-08-06-20:39:45 import
Igor Sysoev <igor@sysoev.ru>
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176 |
4eff17414a43
nginx-0.0.1-2002-08-06-20:39:45 import
Igor Sysoev <igor@sysoev.ru>
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177 |
2806 | 178 ngx_listening_t *ngx_create_listening(ngx_conf_t *cf, void *sockaddr, |
179 socklen_t socklen); | |
219
f57597ec5249
nginx-0.0.1-2004-01-06-19:49:34 import
Igor Sysoev <igor@sysoev.ru>
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218
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180 ngx_int_t ngx_set_inherited_sockets(ngx_cycle_t *cycle); |
218
05592fd7a436
nginx-0.0.1-2004-01-05-23:55:48 import
Igor Sysoev <igor@sysoev.ru>
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216
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181 ngx_int_t ngx_open_listening_sockets(ngx_cycle_t *cycle); |
2802 | 182 void ngx_configure_listening_sockets(ngx_cycle_t *cycle); |
218
05592fd7a436
nginx-0.0.1-2004-01-05-23:55:48 import
Igor Sysoev <igor@sysoev.ru>
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216
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183 void ngx_close_listening_sockets(ngx_cycle_t *cycle); |
417
0526206251f6
nginx-0.0.10-2004-09-07-19:29:22 import
Igor Sysoev <igor@sysoev.ru>
parents:
399
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184 void ngx_close_connection(ngx_connection_t *c); |
2854
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ngx_connection_local_sockaddr()
Igor Sysoev <igor@sysoev.ru>
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2806
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185 ngx_int_t ngx_connection_local_sockaddr(ngx_connection_t *c, ngx_str_t *s, |
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ngx_connection_local_sockaddr()
Igor Sysoev <igor@sysoev.ru>
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2806
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186 ngx_uint_t port); |
253
b6793bc5034b
nginx-0.0.2-2004-02-09-10:46:43 import
Igor Sysoev <igor@sysoev.ru>
parents:
219
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187 ngx_int_t ngx_connection_error(ngx_connection_t *c, ngx_err_t err, char *text); |
218
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nginx-0.0.1-2004-01-05-23:55:48 import
Igor Sysoev <igor@sysoev.ru>
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216
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188 |
543 | 189 ngx_connection_t *ngx_get_connection(ngx_socket_t s, ngx_log_t *log); |
190 void ngx_free_connection(ngx_connection_t *c); | |
91
637625a2acdb
nginx-0.0.1-2003-05-19-20:39:14 import
Igor Sysoev <igor@sysoev.ru>
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87
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191 |
3880
e3cb8e27e413
reuse keepalive connections if there are no free worker connections
Igor Sysoev <igor@sysoev.ru>
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3676
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192 void ngx_reusable_connection(ngx_connection_t *c, ngx_uint_t reusable); |
91
637625a2acdb
nginx-0.0.1-2003-05-19-20:39:14 import
Igor Sysoev <igor@sysoev.ru>
parents:
87
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193 |
0
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nginx-0.0.1-2002-08-06-20:39:45 import
Igor Sysoev <igor@sysoev.ru>
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194 #endif /* _NGX_CONNECTION_H_INCLUDED_ */ |