Mercurial > hg > nginx-quic
annotate src/core/ngx_cycle.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 | d620f497c50f |
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_CYCLE_H_INCLUDED_ |
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8 #define _NGX_CYCLE_H_INCLUDED_ |
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11 #include <ngx_config.h> |
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12 #include <ngx_core.h> |
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14 |
507 | 15 #ifndef NGX_CYCLE_POOL_SIZE |
16 #define NGX_CYCLE_POOL_SIZE 16384 | |
17 #endif | |
18 | |
19 | |
461 | 20 #define NGX_DEBUG_POINTS_STOP 1 |
21 #define NGX_DEBUG_POINTS_ABORT 2 | |
22 | |
23 | |
972 | 24 typedef struct ngx_shm_zone_s ngx_shm_zone_t; |
25 | |
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26 typedef ngx_int_t (*ngx_shm_zone_init_pt) (ngx_shm_zone_t *zone, void *data); |
972 | 27 |
28 struct ngx_shm_zone_s { | |
29 void *data; | |
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30 ngx_shm_t shm; |
972 | 31 ngx_shm_zone_init_pt init; |
32 void *tag; | |
33 }; | |
860
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34 |
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35 |
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36 struct ngx_cycle_s { |
473 | 37 void ****conf_ctx; |
38 ngx_pool_t *pool; | |
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39 |
473 | 40 ngx_log_t *log; |
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41 ngx_log_t new_log; |
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42 |
543 | 43 ngx_connection_t **files; |
44 ngx_connection_t *free_connections; | |
45 ngx_uint_t free_connection_n; | |
46 | |
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47 ngx_queue_t reusable_connections_queue; |
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48 |
473 | 49 ngx_array_t listening; |
50 ngx_array_t pathes; | |
51 ngx_list_t open_files; | |
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52 ngx_list_t shared_memory; |
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53 |
473 | 54 ngx_uint_t connection_n; |
543 | 55 ngx_uint_t files_n; |
56 | |
561 | 57 ngx_connection_t *connections; |
58 ngx_event_t *read_events; | |
59 ngx_event_t *write_events; | |
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473 | 61 ngx_cycle_t *old_cycle; |
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62 |
473 | 63 ngx_str_t conf_file; |
2073 | 64 ngx_str_t conf_param; |
2758 | 65 ngx_str_t conf_prefix; |
66 ngx_str_t prefix; | |
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67 ngx_str_t lock_file; |
2011 | 68 ngx_str_t hostname; |
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69 }; |
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70 |
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72 typedef struct { |
473 | 73 ngx_flag_t daemon; |
74 ngx_flag_t master; | |
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75 |
563 | 76 ngx_msec_t timer_resolution; |
77 | |
473 | 78 ngx_int_t worker_processes; |
79 ngx_int_t debug_points; | |
300
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80 |
543 | 81 ngx_int_t rlimit_nofile; |
82 ngx_int_t rlimit_sigpending; | |
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83 off_t rlimit_core; |
543 | 84 |
473 | 85 int priority; |
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86 |
577 | 87 ngx_uint_t cpu_affinity_n; |
88 u_long *cpu_affinity; | |
89 | |
473 | 90 char *username; |
91 ngx_uid_t user; | |
92 ngx_gid_t group; | |
93 | |
521 | 94 ngx_str_t working_directory; |
611 | 95 ngx_str_t lock_file; |
521 | 96 |
473 | 97 ngx_str_t pid; |
543 | 98 ngx_str_t oldpid; |
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99 |
1069 | 100 ngx_array_t env; |
101 char **environment; | |
102 | |
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103 #if (NGX_THREADS) |
473 | 104 ngx_int_t worker_threads; |
105 size_t thread_stack_size; | |
376
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106 #endif |
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107 |
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108 } ngx_core_conf_t; |
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109 |
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110 |
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111 typedef struct { |
473 | 112 ngx_pool_t *pool; /* pcre's malloc() pool */ |
381
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113 } ngx_core_tls_t; |
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114 |
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115 |
611 | 116 #define ngx_is_init_cycle(cycle) (cycle->conf_ctx == NULL) |
605 | 117 |
118 | |
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119 ngx_cycle_t *ngx_init_cycle(ngx_cycle_t *old_cycle); |
611 | 120 ngx_int_t ngx_create_pidfile(ngx_str_t *name, ngx_log_t *log); |
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121 void ngx_delete_pidfile(ngx_cycle_t *cycle); |
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122 ngx_int_t ngx_signal_process(ngx_cycle_t *cycle, char *sig); |
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123 void ngx_reopen_files(ngx_cycle_t *cycle, ngx_uid_t user); |
1069 | 124 char **ngx_set_environment(ngx_cycle_t *cycle, ngx_uint_t *last); |
278
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125 ngx_pid_t ngx_exec_new_binary(ngx_cycle_t *cycle, char *const *argv); |
577 | 126 u_long ngx_get_cpu_affinity(ngx_uint_t n); |
972 | 127 ngx_shm_zone_t *ngx_shared_memory_add(ngx_conf_t *cf, ngx_str_t *name, |
128 size_t size, void *tag); | |
218
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129 |
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130 |
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131 extern volatile ngx_cycle_t *ngx_cycle; |
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132 extern ngx_array_t ngx_old_cycles; |
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133 extern ngx_module_t ngx_core_module; |
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134 extern ngx_uint_t ngx_test_config; |
3750 | 135 extern ngx_uint_t ngx_quiet_mode; |
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136 #if (NGX_THREADS) |
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137 extern ngx_tls_key_t ngx_core_tls_key; |
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138 #endif |
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139 |
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141 #endif /* _NGX_CYCLE_H_INCLUDED_ */ |