Mercurial > hg > nginx-quic
annotate src/core/ngx_regex.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 | 42c16d8bddbe |
children | 005fc2d5e84f 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_REGEX_H_INCLUDED_ |
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8 #define _NGX_REGEX_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 #include <pcre.h> |
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17 #define NGX_REGEX_NO_MATCHED PCRE_ERROR_NOMATCH /* -1 */ |
481 | 18 |
19 #define NGX_REGEX_CASELESS PCRE_CASELESS | |
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21 typedef pcre ngx_regex_t; |
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3325 | 23 |
1784 | 24 typedef struct { |
3325 | 25 ngx_str_t pattern; |
26 ngx_pool_t *pool; | |
27 ngx_int_t options; | |
28 | |
29 ngx_regex_t *regex; | |
30 int captures; | |
31 int named_captures; | |
32 int name_size; | |
33 u_char *names; | |
34 ngx_str_t err; | |
35 } ngx_regex_compile_t; | |
36 | |
37 | |
38 typedef struct { | |
39 ngx_regex_t *regex; | |
40 u_char *name; | |
1784 | 41 } ngx_regex_elt_t; |
42 | |
43 | |
499 | 44 void ngx_regex_init(void); |
3325 | 45 ngx_int_t ngx_regex_compile(ngx_regex_compile_t *rc); |
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46 |
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47 #define ngx_regex_exec(re, s, captures, size) \ |
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48 pcre_exec(re, NULL, (const char *) (s)->data, (s)->len, 0, 0, \ |
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49 captures, size) |
3325 | 50 #define ngx_regex_exec_n "pcre_exec()" |
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51 |
1784 | 52 ngx_int_t ngx_regex_exec_array(ngx_array_t *a, ngx_str_t *s, ngx_log_t *log); |
53 | |
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55 #endif /* _NGX_REGEX_H_INCLUDED_ */ |