Mercurial > hg > nginx-quic
annotate src/event/ngx_event_posted.c @ 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> |
---|---|
date | Wed, 12 Oct 2011 14:22:48 +0000 |
parents | 9c2f3ed7a247 |
children | d620f497c50f |
rev | line source |
---|---|
441
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1 |
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2 /* |
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3 * Copyright (C) Igor Sysoev |
441
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4 */ |
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6 |
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7 #include <ngx_config.h> |
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8 #include <ngx_core.h> |
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9 #include <ngx_event.h> |
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10 |
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11 |
563 | 12 ngx_thread_volatile ngx_event_t *ngx_posted_accept_events; |
306
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13 ngx_thread_volatile ngx_event_t *ngx_posted_events; |
370
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14 |
306
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15 #if (NGX_THREADS) |
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16 ngx_mutex_t *ngx_posted_events_mutex; |
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17 #endif |
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18 |
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19 |
563 | 20 void |
21 ngx_event_process_posted(ngx_cycle_t *cycle, | |
22 ngx_thread_volatile ngx_event_t **posted) | |
306
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23 { |
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24 ngx_event_t *ev; |
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25 |
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26 for ( ;; ) { |
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27 |
563 | 28 ev = (ngx_event_t *) *posted; |
306
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29 |
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30 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, cycle->log, 0, |
461 | 31 "posted event %p", ev); |
306
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32 |
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33 if (ev == NULL) { |
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34 return; |
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35 } |
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36 |
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37 ngx_delete_posted_event(ev); |
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38 |
509 | 39 ev->handler(ev); |
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40 } |
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41 } |
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42 |
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43 |
461 | 44 #if (NGX_THREADS) && !(NGX_WIN32) |
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45 |
563 | 46 void |
47 ngx_wakeup_worker_thread(ngx_cycle_t *cycle) | |
376
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48 { |
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49 ngx_int_t i; |
501 | 50 #if 0 |
377
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51 ngx_uint_t busy; |
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52 ngx_event_t *ev; |
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53 |
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54 busy = 1; |
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55 |
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56 if (ngx_mutex_lock(ngx_posted_events_mutex) == NGX_ERROR) { |
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57 return; |
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58 } |
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59 |
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60 for (ev = (ngx_event_t *) ngx_posted_events; ev; ev = ev->next) { |
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61 if (*(ev->lock) == 0) { |
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62 busy = 0; |
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63 break; |
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64 } |
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65 } |
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66 |
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67 ngx_mutex_unlock(ngx_posted_events_mutex); |
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68 |
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69 if (busy) { |
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70 return; |
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71 } |
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72 #endif |
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73 |
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74 for (i = 0; i < ngx_threads_n; i++) { |
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75 if (ngx_threads[i].state == NGX_THREAD_FREE) { |
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76 ngx_cond_signal(ngx_threads[i].cv); |
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77 return; |
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78 } |
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79 } |
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80 } |
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81 |
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82 |
563 | 83 ngx_int_t |
84 ngx_event_thread_process_posted(ngx_cycle_t *cycle) | |
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85 { |
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86 ngx_event_t *ev; |
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87 |
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88 for ( ;; ) { |
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89 |
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90 ev = (ngx_event_t *) ngx_posted_events; |
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91 |
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92 for ( ;; ) { |
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93 |
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94 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, cycle->log, 0, |
461 | 95 "posted event %p", ev); |
370
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96 |
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97 if (ev == NULL) { |
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98 return NGX_OK; |
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99 } |
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100 |
371
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101 if (ngx_trylock(ev->lock) == 0) { |
370
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102 |
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103 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, cycle->log, 0, |
461 | 104 "posted event %p is busy", ev); |
370
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105 |
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106 ev = ev->next; |
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107 continue; |
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108 } |
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109 |
380
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110 if (ev->lock != ev->own_lock) { |
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111 if (*(ev->own_lock)) { |
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112 ngx_log_error(NGX_LOG_ALERT, cycle->log, 0, |
461 | 113 "the own lock of the posted event %p is busy", ev); |
380
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114 ngx_unlock(ev->lock); |
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115 ev = ev->next; |
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nginx-0.0.7-2004-07-07-10:15:04 import
Igor Sysoev <igor@sysoev.ru>
parents:
379
diff
changeset
|
116 continue; |
5ce6561246a5
nginx-0.0.7-2004-07-07-10:15:04 import
Igor Sysoev <igor@sysoev.ru>
parents:
379
diff
changeset
|
117 } |
5ce6561246a5
nginx-0.0.7-2004-07-07-10:15:04 import
Igor Sysoev <igor@sysoev.ru>
parents:
379
diff
changeset
|
118 *(ev->own_lock) = 1; |
5ce6561246a5
nginx-0.0.7-2004-07-07-10:15:04 import
Igor Sysoev <igor@sysoev.ru>
parents:
379
diff
changeset
|
119 } |
5ce6561246a5
nginx-0.0.7-2004-07-07-10:15:04 import
Igor Sysoev <igor@sysoev.ru>
parents:
379
diff
changeset
|
120 |
375
744ccb59062d
nginx-0.0.7-2004-07-02-19:54:34 import
Igor Sysoev <igor@sysoev.ru>
parents:
374
diff
changeset
|
121 ngx_delete_posted_event(ev); |
306
6b91bfbc4123
nginx-0.0.3-2004-04-05-00:32:09 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
|
122 |
374
213f17e9f776
nginx-0.0.7-2004-07-02-09:47:00 import
Igor Sysoev <igor@sysoev.ru>
parents:
373
diff
changeset
|
123 ev->locked = 1; |
370
54f76b0b8dca
nginx-0.0.7-2004-06-27-22:01:57 import
Igor Sysoev <igor@sysoev.ru>
parents:
350
diff
changeset
|
124 |
375
744ccb59062d
nginx-0.0.7-2004-07-02-19:54:34 import
Igor Sysoev <igor@sysoev.ru>
parents:
374
diff
changeset
|
125 ev->ready |= ev->posted_ready; |
744ccb59062d
nginx-0.0.7-2004-07-02-19:54:34 import
Igor Sysoev <igor@sysoev.ru>
parents:
374
diff
changeset
|
126 ev->timedout |= ev->posted_timedout; |
744ccb59062d
nginx-0.0.7-2004-07-02-19:54:34 import
Igor Sysoev <igor@sysoev.ru>
parents:
374
diff
changeset
|
127 ev->pending_eof |= ev->posted_eof; |
469 | 128 #if (NGX_HAVE_KQUEUE) |
375
744ccb59062d
nginx-0.0.7-2004-07-02-19:54:34 import
Igor Sysoev <igor@sysoev.ru>
parents:
374
diff
changeset
|
129 ev->kq_errno |= ev->posted_errno; |
374
213f17e9f776
nginx-0.0.7-2004-07-02-09:47:00 import
Igor Sysoev <igor@sysoev.ru>
parents:
373
diff
changeset
|
130 #endif |
377
41437e4fd9b4
nginx-0.0.7-2004-07-05-19:08:23 import
Igor Sysoev <igor@sysoev.ru>
parents:
376
diff
changeset
|
131 if (ev->posted_available) { |
41437e4fd9b4
nginx-0.0.7-2004-07-05-19:08:23 import
Igor Sysoev <igor@sysoev.ru>
parents:
376
diff
changeset
|
132 ev->available = ev->posted_available; |
41437e4fd9b4
nginx-0.0.7-2004-07-05-19:08:23 import
Igor Sysoev <igor@sysoev.ru>
parents:
376
diff
changeset
|
133 } |
375
744ccb59062d
nginx-0.0.7-2004-07-02-19:54:34 import
Igor Sysoev <igor@sysoev.ru>
parents:
374
diff
changeset
|
134 |
744ccb59062d
nginx-0.0.7-2004-07-02-19:54:34 import
Igor Sysoev <igor@sysoev.ru>
parents:
374
diff
changeset
|
135 ev->posted_ready = 0; |
744ccb59062d
nginx-0.0.7-2004-07-02-19:54:34 import
Igor Sysoev <igor@sysoev.ru>
parents:
374
diff
changeset
|
136 ev->posted_timedout = 0; |
744ccb59062d
nginx-0.0.7-2004-07-02-19:54:34 import
Igor Sysoev <igor@sysoev.ru>
parents:
374
diff
changeset
|
137 ev->posted_eof = 0; |
469 | 138 #if (NGX_HAVE_KQUEUE) |
375
744ccb59062d
nginx-0.0.7-2004-07-02-19:54:34 import
Igor Sysoev <igor@sysoev.ru>
parents:
374
diff
changeset
|
139 ev->posted_errno = 0; |
744ccb59062d
nginx-0.0.7-2004-07-02-19:54:34 import
Igor Sysoev <igor@sysoev.ru>
parents:
374
diff
changeset
|
140 #endif |
377
41437e4fd9b4
nginx-0.0.7-2004-07-05-19:08:23 import
Igor Sysoev <igor@sysoev.ru>
parents:
376
diff
changeset
|
141 ev->posted_available = 0; |
370
54f76b0b8dca
nginx-0.0.7-2004-06-27-22:01:57 import
Igor Sysoev <igor@sysoev.ru>
parents:
350
diff
changeset
|
142 |
374
213f17e9f776
nginx-0.0.7-2004-07-02-09:47:00 import
Igor Sysoev <igor@sysoev.ru>
parents:
373
diff
changeset
|
143 ngx_mutex_unlock(ngx_posted_events_mutex); |
213f17e9f776
nginx-0.0.7-2004-07-02-09:47:00 import
Igor Sysoev <igor@sysoev.ru>
parents:
373
diff
changeset
|
144 |
509 | 145 ev->handler(ev); |
370
54f76b0b8dca
nginx-0.0.7-2004-06-27-22:01:57 import
Igor Sysoev <igor@sysoev.ru>
parents:
350
diff
changeset
|
146 |
563 | 147 ngx_mutex_lock(ngx_posted_events_mutex); |
370
54f76b0b8dca
nginx-0.0.7-2004-06-27-22:01:57 import
Igor Sysoev <igor@sysoev.ru>
parents:
350
diff
changeset
|
148 |
374
213f17e9f776
nginx-0.0.7-2004-07-02-09:47:00 import
Igor Sysoev <igor@sysoev.ru>
parents:
373
diff
changeset
|
149 if (ev->locked) { |
213f17e9f776
nginx-0.0.7-2004-07-02-09:47:00 import
Igor Sysoev <igor@sysoev.ru>
parents:
373
diff
changeset
|
150 ngx_unlock(ev->lock); |
380
5ce6561246a5
nginx-0.0.7-2004-07-07-10:15:04 import
Igor Sysoev <igor@sysoev.ru>
parents:
379
diff
changeset
|
151 |
5ce6561246a5
nginx-0.0.7-2004-07-07-10:15:04 import
Igor Sysoev <igor@sysoev.ru>
parents:
379
diff
changeset
|
152 if (ev->lock != ev->own_lock) { |
5ce6561246a5
nginx-0.0.7-2004-07-07-10:15:04 import
Igor Sysoev <igor@sysoev.ru>
parents:
379
diff
changeset
|
153 ngx_unlock(ev->own_lock); |
5ce6561246a5
nginx-0.0.7-2004-07-07-10:15:04 import
Igor Sysoev <igor@sysoev.ru>
parents:
379
diff
changeset
|
154 } |
374
213f17e9f776
nginx-0.0.7-2004-07-02-09:47:00 import
Igor Sysoev <igor@sysoev.ru>
parents:
373
diff
changeset
|
155 } |
213f17e9f776
nginx-0.0.7-2004-07-02-09:47:00 import
Igor Sysoev <igor@sysoev.ru>
parents:
373
diff
changeset
|
156 |
379
73688d5d7fc3
nginx-0.0.7-2004-07-06-20:12:16 import
Igor Sysoev <igor@sysoev.ru>
parents:
377
diff
changeset
|
157 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, cycle->log, 0, |
461 | 158 "posted event %p is done", ev); |
379
73688d5d7fc3
nginx-0.0.7-2004-07-06-20:12:16 import
Igor Sysoev <igor@sysoev.ru>
parents:
377
diff
changeset
|
159 |
370
54f76b0b8dca
nginx-0.0.7-2004-06-27-22:01:57 import
Igor Sysoev <igor@sysoev.ru>
parents:
350
diff
changeset
|
160 break; |
54f76b0b8dca
nginx-0.0.7-2004-06-27-22:01:57 import
Igor Sysoev <igor@sysoev.ru>
parents:
350
diff
changeset
|
161 } |
306
6b91bfbc4123
nginx-0.0.3-2004-04-05-00:32:09 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
|
162 } |
6b91bfbc4123
nginx-0.0.3-2004-04-05-00:32:09 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
|
163 } |
6b91bfbc4123
nginx-0.0.3-2004-04-05-00:32:09 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
|
164 |
376
d0451e402e27
nginx-0.0.7-2004-07-05-10:55:54 import
Igor Sysoev <igor@sysoev.ru>
parents:
375
diff
changeset
|
165 #else |
d0451e402e27
nginx-0.0.7-2004-07-05-10:55:54 import
Igor Sysoev <igor@sysoev.ru>
parents:
375
diff
changeset
|
166 |
563 | 167 void |
168 ngx_wakeup_worker_thread(ngx_cycle_t *cycle) | |
376
d0451e402e27
nginx-0.0.7-2004-07-05-10:55:54 import
Igor Sysoev <igor@sysoev.ru>
parents:
375
diff
changeset
|
169 { |
d0451e402e27
nginx-0.0.7-2004-07-05-10:55:54 import
Igor Sysoev <igor@sysoev.ru>
parents:
375
diff
changeset
|
170 } |
d0451e402e27
nginx-0.0.7-2004-07-05-10:55:54 import
Igor Sysoev <igor@sysoev.ru>
parents:
375
diff
changeset
|
171 |
306
6b91bfbc4123
nginx-0.0.3-2004-04-05-00:32:09 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
|
172 #endif |