Mercurial > hg > nginx-quic
view src/os/unix/ngx_darwin_config.h @ 4667:d05ab8793a69 stable-1.2
Merge of r4622, r4623: balancing changes.
*) 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).
*) Upstream: fixed ip_hash rebalancing with the "down" flag.
Due to weight being set to 0 for down peers, order of peers after sorting
wasn't the same as without the "down" flag (with down peers at the end),
resulting in client rebalancing for clients on other servers. The only
rebalancing which should happen after adding "down" to a server is one
for clients on the server.
The problem was introduced in r1377 (which fixed endless loop by setting
weight to 0 for down servers). The loop is no longer possible with new
smooth algorithm, so preserving original weight is safe.
author | Maxim Dounin <mdounin@mdounin.ru> |
---|---|
date | Mon, 04 Jun 2012 11:21:58 +0000 |
parents | d620f497c50f |
children | 72e31d88defa |
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/* * Copyright (C) Igor Sysoev * Copyright (C) Nginx, Inc. */ #ifndef _NGX_DARWIN_CONFIG_H_INCLUDED_ #define _NGX_DARWIN_CONFIG_H_INCLUDED_ #define MAC_OS_X_VERSION_MIN_REQUIRED MAC_OS_X_VERSION_10_0 #include <sys/types.h> #include <sys/time.h> #include <unistd.h> #include <inttypes.h> #include <stdarg.h> #include <stddef.h> /* offsetof() */ #include <stdio.h> #include <stdlib.h> #include <errno.h> #include <string.h> #include <signal.h> #include <pwd.h> #include <grp.h> #include <dirent.h> #include <glob.h> #include <sys/mount.h> /* statfs() */ #include <sys/filio.h> /* FIONBIO */ #include <sys/ioctl.h> #include <sys/uio.h> #include <sys/stat.h> #include <fcntl.h> #include <sys/wait.h> #include <sys/mman.h> #include <sys/resource.h> #include <sched.h> #include <sys/socket.h> #include <netinet/in.h> #include <netinet/tcp.h> /* TCP_NODELAY */ #include <arpa/inet.h> #include <netdb.h> #include <sys/un.h> #include <sys/sysctl.h> #include <xlocale.h> #ifndef IOV_MAX #define IOV_MAX 64 #endif #include <ngx_auto_config.h> #if (NGX_HAVE_POSIX_SEM) #include <semaphore.h> #endif #if (NGX_HAVE_POLL) #include <poll.h> #endif #if (NGX_HAVE_KQUEUE) #include <sys/event.h> #endif #define NGX_LISTEN_BACKLOG -1 #ifndef NGX_HAVE_INHERITED_NONBLOCK #define NGX_HAVE_INHERITED_NONBLOCK 1 #endif #ifndef NGX_HAVE_CASELESS_FILESYSTEM #define NGX_HAVE_CASELESS_FILESYSTEM 1 #endif #define NGX_HAVE_OS_SPECIFIC_INIT 1 #define NGX_HAVE_DEBUG_MALLOC 1 extern char **environ; #endif /* _NGX_DARWIN_CONFIG_H_INCLUDED_ */