Mercurial > hg > nginx
view auto/feature @ 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> |
---|---|
date | Wed, 12 Oct 2011 14:22:48 +0000 |
parents | 0ec738f18346 |
children | d620f497c50f |
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# Copyright (C) Igor Sysoev echo $ngx_n "checking for $ngx_feature ...$ngx_c" cat << END >> $NGX_AUTOCONF_ERR ---------------------------------------- checking for $ngx_feature END ngx_found=no if test -n "$ngx_feature_name"; then ngx_have_feature=`echo $ngx_feature_name \ | tr abcdefghijklmnopqrstuvwxyz ABCDEFGHIJKLMNOPQRSTUVWXYZ` fi if test -n "$ngx_feature_path"; then for ngx_temp in $ngx_feature_path; do ngx_feature_inc_path="$ngx_feature_inc_path -I $ngx_temp" done fi cat << END > $NGX_AUTOTEST.c #include <sys/types.h> $NGX_INCLUDE_UNISTD_H $ngx_feature_incs int main() { $ngx_feature_test; return 0; } END ngx_test="$CC $CC_TEST_FLAGS $CC_AUX_FLAGS $ngx_feature_inc_path \ -o $NGX_AUTOTEST $NGX_AUTOTEST.c $NGX_TEST_LD_OPT $ngx_feature_libs" ngx_feature_inc_path= eval "/bin/sh -c \"$ngx_test\" >> $NGX_AUTOCONF_ERR 2>&1" if [ -x $NGX_AUTOTEST ]; then case "$ngx_feature_run" in yes) # /bin/sh is used to intercept "Killed" or "Abort trap" messages if /bin/sh -c $NGX_AUTOTEST >> $NGX_AUTOCONF_ERR 2>&1; then echo " found" ngx_found=yes if test -n "$ngx_feature_name"; then have=$ngx_have_feature . auto/have fi else echo " found but is not working" fi ;; value) # /bin/sh is used to intercept "Killed" or "Abort trap" messages if /bin/sh -c $NGX_AUTOTEST >> $NGX_AUTOCONF_ERR 2>&1; then echo " found" ngx_found=yes cat << END >> $NGX_AUTO_CONFIG_H #ifndef $ngx_feature_name #define $ngx_feature_name `$NGX_AUTOTEST` #endif END else echo " found but is not working" fi ;; bug) # /bin/sh is used to intercept "Killed" or "Abort trap" messages if /bin/sh -c $NGX_AUTOTEST >> $NGX_AUTOCONF_ERR 2>&1; then echo " not found" else echo " found" ngx_found=yes if test -n "$ngx_feature_name"; then have=$ngx_have_feature . auto/have fi fi ;; *) echo " found" ngx_found=yes if test -n "$ngx_feature_name"; then have=$ngx_have_feature . auto/have fi ;; esac else echo " not found" echo "----------" >> $NGX_AUTOCONF_ERR cat $NGX_AUTOTEST.c >> $NGX_AUTOCONF_ERR echo "----------" >> $NGX_AUTOCONF_ERR echo $ngx_test >> $NGX_AUTOCONF_ERR echo "----------" >> $NGX_AUTOCONF_ERR fi rm $NGX_AUTOTEST*