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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 dadfa78d2270
children d620f497c50f
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# Copyright (C) Igor Sysoev


# Compaq C V6.5-207

ngx_include_opt="-I"

# warnings

CFLAGS="$CFLAGS -msg_enable level6 -msg_fatal level6"

CFLAGS="$CFLAGS -msg_disable unknownmacro"
CFLAGS="$CFLAGS -msg_disable unusedincl"
CFLAGS="$CFLAGS -msg_disable unnecincl"
CFLAGS="$CFLAGS -msg_disable nestincl"
CFLAGS="$CFLAGS -msg_disable strctpadding"
CFLAGS="$CFLAGS -msg_disable ansialiascast"
CFLAGS="$CFLAGS -msg_disable inlinestoclsmod"
CFLAGS="$CFLAGS -msg_disable cxxkeyword"
CFLAGS="$CFLAGS -msg_disable longlongsufx"
CFLAGS="$CFLAGS -msg_disable valuepres"

# STUB
CFLAGS="$CFLAGS -msg_disable truncintcast"
CFLAGS="$CFLAGS -msg_disable trunclongcast"

CFLAGS="$CFLAGS -msg_disable truncintasn"
CFLAGS="$CFLAGS -msg_disable trunclongint"
CFLAGS="$CFLAGS -msg_disable intconcastsgn"
CFLAGS="$CFLAGS -msg_disable intconstsign"
CFLAGS="$CFLAGS -msg_disable switchlong"
CFLAGS="$CFLAGS -msg_disable subscrbounds2"

CFLAGS="$CFLAGS -msg_disable hexoctunsign"

CFLAGS="$CFLAGS -msg_disable ignorecallval"
CFLAGS="$CFLAGS -msg_disable nonstandcast"
CFLAGS="$CFLAGS -msg_disable embedcomment"
CFLAGS="$CFLAGS -msg_disable unreachcode"
CFLAGS="$CFLAGS -msg_disable questcompare2"
CFLAGS="$CFLAGS -msg_disable unusedtop"
CFLAGS="$CFLAGS -msg_disable unrefdecl"

CFLAGS="$CFLAGS -msg_disable bitnotint"