Hi,
I am using rand(x) in configuration to make some routing decisions. I
am basically load balancing between backends and using the following
configuration
use_backend bk_1 { rand(100) le 50 }
default_backend bk_2
However, I am not seeing any traffic going to bk_2 and all traffic
goes to bk_1. It seems that there is a bug in smp_fetch_rand function
around reduction.
I did some further testing by setting up a header using
http-request set-header X-RAND %[rand(200)]
and printing that header in a file. I am unable to see the random
value going above arg/2.
Here is my haproxy build information.
HA-Proxy version 1.5.9 2014/11/26
Copyright 2000-2014 Willy Tarreau <[email protected]>
Build options :
TARGET = linux2628
CPU = generic
CC = gcc
CFLAGS = -O2 -g -fno-strict-aliasing
OPTIONS = USE_ZLIB=1 USE_OPENSSL=1 USE_STATIC_PCRE=1
Default settings :
maxconn = 2000, bufsize = 16384, maxrewrite = 8192, maxpollevents = 200
Encrypted password support via crypt(3): yes
Built with zlib version : 1.2.8
Compression algorithms supported : identity, deflate, gzip
Built with OpenSSL version : OpenSSL 1.0.1f 6 Jan 2014
Running on OpenSSL version : OpenSSL 1.0.1f 6 Jan 2014
OpenSSL library supports TLS extensions : yes
OpenSSL library supports SNI : yes
OpenSSL library supports prefer-server-ciphers : yes
Built with PCRE version : 8.31 2012-07-06
PCRE library supports JIT : no (USE_PCRE_JIT not set)
Built with transparent proxy support using: IP_TRANSPARENT
IPV6_TRANSPARENT IP_FREEBIND
Available polling systems :
epoll : pref=300, test result OK
poll : pref=200, test result OK
select : pref=150, test result OK
Total: 3 (3 usable), will use epoll.
