2006-12-05 00:46:13 +08:00
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/*
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* Copyright (C) Igor Sysoev
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2012-01-18 23:07:43 +08:00
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* Copyright (C) Nginx, Inc.
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2006-12-05 00:46:13 +08:00
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*/
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#ifndef _NGX_HTTP_UPSTREAM_ROUND_ROBIN_H_INCLUDED_
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#define _NGX_HTTP_UPSTREAM_ROUND_ROBIN_H_INCLUDED_
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#include <ngx_config.h>
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#include <ngx_core.h>
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#include <ngx_http.h>
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typedef struct {
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struct sockaddr *sockaddr;
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socklen_t socklen;
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ngx_str_t name;
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2014-06-02 20:16:22 +08:00
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ngx_str_t server;
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2006-12-05 00:46:13 +08:00
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2007-07-29 00:04:01 +08:00
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ngx_int_t current_weight;
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Upstream: smooth weighted round-robin balancing.
For edge case weights like { 5, 1, 1 } we now produce { a, a, b, a, c, a, a }
sequence instead of { c, b, a, a, a, a, a } produced previously.
Algorithm is as follows: on each peer selection we increase current_weight
of each eligible peer by its weight, select peer with greatest current_weight
and reduce its current_weight by total number of weight points distributed
among peers.
In case of { 5, 1, 1 } weights this gives the following sequence of
current_weight's:
a b c
0 0 0 (initial state)
5 1 1 (a selected)
-2 1 1
3 2 2 (a selected)
-4 2 2
1 3 3 (b selected)
1 -4 3
6 -3 4 (a selected)
-1 -3 4
4 -2 5 (c selected)
4 -2 -2
9 -1 -1 (a selected)
2 -1 -1
7 0 0 (a selected)
0 0 0
To preserve weight reduction in case of failures the effective_weight
variable was introduced, which usually matches peer's weight, but is
reduced temporarily on peer failures.
This change also fixes loop with backup servers and proxy_next_upstream
http_404 (ticket #47), and skipping alive upstreams in some cases if there
are multiple dead ones (ticket #64).
2012-05-14 17:57:20 +08:00
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ngx_int_t effective_weight;
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2007-07-29 00:04:01 +08:00
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ngx_int_t weight;
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2006-12-05 00:46:13 +08:00
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2015-04-10 18:16:23 +08:00
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ngx_uint_t conns;
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2006-12-05 00:46:13 +08:00
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ngx_uint_t fails;
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time_t accessed;
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2011-10-12 22:22:48 +08:00
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time_t checked;
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2006-12-05 00:46:13 +08:00
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ngx_uint_t max_fails;
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time_t fail_timeout;
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ngx_uint_t down; /* unsigned down:1; */
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2007-07-29 00:04:01 +08:00
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#if (NGX_HTTP_SSL)
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2007-07-11 05:04:37 +08:00
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ngx_ssl_session_t *ssl_session; /* local to a process */
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2006-12-05 00:46:13 +08:00
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#endif
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} ngx_http_upstream_rr_peer_t;
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2007-08-09 21:54:33 +08:00
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typedef struct ngx_http_upstream_rr_peers_s ngx_http_upstream_rr_peers_t;
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struct ngx_http_upstream_rr_peers_s {
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2006-12-05 00:46:13 +08:00
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ngx_uint_t number;
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2012-06-04 07:22:41 +08:00
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ngx_uint_t total_weight;
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unsigned single:1;
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unsigned weighted:1;
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2006-12-05 00:46:13 +08:00
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ngx_str_t *name;
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2007-08-09 21:54:33 +08:00
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ngx_http_upstream_rr_peers_t *next;
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2006-12-05 00:46:13 +08:00
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ngx_http_upstream_rr_peer_t peer[1];
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2007-08-09 21:54:33 +08:00
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};
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2006-12-05 00:46:13 +08:00
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typedef struct {
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ngx_http_upstream_rr_peers_t *peers;
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ngx_uint_t current;
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2006-12-25 05:07:34 +08:00
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uintptr_t *tried;
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2006-12-05 00:46:13 +08:00
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uintptr_t data;
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} ngx_http_upstream_rr_peer_data_t;
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ngx_int_t ngx_http_upstream_init_round_robin(ngx_conf_t *cf,
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ngx_http_upstream_srv_conf_t *us);
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ngx_int_t ngx_http_upstream_init_round_robin_peer(ngx_http_request_t *r,
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ngx_http_upstream_srv_conf_t *us);
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2007-11-27 21:34:13 +08:00
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ngx_int_t ngx_http_upstream_create_round_robin_peer(ngx_http_request_t *r,
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ngx_http_upstream_resolved_t *ur);
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2006-12-05 00:46:13 +08:00
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ngx_int_t ngx_http_upstream_get_round_robin_peer(ngx_peer_connection_t *pc,
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void *data);
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void ngx_http_upstream_free_round_robin_peer(ngx_peer_connection_t *pc,
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void *data, ngx_uint_t state);
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#if (NGX_HTTP_SSL)
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2007-07-11 05:04:37 +08:00
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ngx_int_t
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ngx_http_upstream_set_round_robin_peer_session(ngx_peer_connection_t *pc,
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void *data);
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void ngx_http_upstream_save_round_robin_peer_session(ngx_peer_connection_t *pc,
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2006-12-05 00:46:13 +08:00
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void *data);
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#endif
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#endif /* _NGX_HTTP_UPSTREAM_ROUND_ROBIN_H_INCLUDED_ */
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