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http://nagoya.apache.org/bugzilla/show_bug.cgi?id=26439 Rewritemap with prg: corrupting rewritten URLs under high load? Summary: Rewritemap with prg: corrupting rewritten URLs under high load? Product: Apache httpd-2.0 Version: 2.0.48 Platform: PC OS/Version: Linux Status: NEW Severity: Critical Priority: Other Component: mod_rewrite AssignedTo: [email protected] ReportedBy: [EMAIL PROTECTED] I'm using a rewritemap directive on a front-end apache proxy to call a simple perl script to load balance across 4 back-end servers in a way similar to that suggested in the apache.org rewrite guide. I've subjected the setup to high load (approx 70 transactions a second) and Apache will proxy fine to the back-end servers for a while, then intermittently the back-end servers begin returning 404s because the rewritten URLs have been corrupted. Then the URLs come good, then they go bad. It's intermittent and ONLY under high loads (I'm using siege). It sounds a little similar to case 25520, but in my case, the problem is more than just logging because the rewrite destinations don't recognize the rewritten corrupted URLs. I'm using the Worker MPM - I haven't tried anything else. Í build Apache from source on a Redhat 9 SMP machine with all recent updates (including glibc) applied. I include below an example bad rewrite, the relevant rewrite directives and the perl script in question. I'm not an Apache hacker so sorry if this case is not technical enough. httpd.conf =========== <VirtualHost *:80> ProxyVia On RewriteEngine On RewriteLog /jrcapps/apache/apache/logs/rewrite.log RewriteLogLevel 9 RewriteMap lb prg:/jrcapps/apache/apache/bin/loadbalance.pl RewriteRule / (.*) /VirtualHostBase/http/139.191.42.53:80/VirtualHostRoot/$1 RewriteRule ^/(.+)$ ${lb:$1} [P,L] </VirtualHost> loadbalance.pl ============== #!/usr/bin/perl ## ## loadbalance.pl -- load balancing script ## $| = 1; @names = ( "eejnet-zope1:8080", "eejnet-zope2:8080", "eejnet-zope1:8081", "eejnet-zope2:8081" ); $numserv = scalar(@names); $cnt = 0; while (<STDIN>) { $cnt = (($cnt+1) % $numserv); $server = $names[$cnt-1]; print "http://$server/$_";; } ##EOF## rewite.log example 1 ==================== 127.0.0.1 - - [26/Jan/2004:15:41:52 +0100] [localhost/sid#820a278] [rid#8243558/initial] (2) init rewrite engine with requested uri / (ok) 127.0.0.1 - - [26/Jan/2004:15:41:52 +0100] [localhost/sid#820a278] [rid#8243558/initial] (3) applying pattern '/(.*)' to uri '/' (ok) 127.0.0.1 - - [26/Jan/2004:15:41:52 +0100] [localhost/sid#820a278] [rid#8243558/initial] (2) rewrite / - > /VirtualHostBase/http/139.191.42.53:80/VirtualHostRoot/127.0.0.1 - - [26/Jan/2004:15:41:52 +0100] [localhost/sid#820a278][rid#8243558/initial] (3) applying pattern '^/(.+)$' to uri '/VirtualHostBase/http/139.191.42.53:80/VirtualHostRoot/' (ok) 127.0.0.1 - - [26/Jan/2004:15:41:52 +0100] [localhost/sid#820a278] [rid#82695f0/initial] (5) map lookup OK: map=lb key=VirtualHostBase/http/139.191.42.53:80/VirtualHostRoot/ -> val=http://eejnet-zope2:8081/VirtualHostBase/http/139.191.42.53:lotot (not ok) 127.0.0.1 - - [26/Jan/2004:15:41:52 +0100] [localhost/sid#820a278] [rid#82695f0/initial] (2) rewrite /VirtualHostBase/http/139.191.42.53:80/VirtualHostRoot/ -> http://eejnet-zope2:8081/VirtualHostBase/http/139.191.42.53:lotot (not ok) 127.0.0.1 - - [26/Jan/2004:15:41:52 +0100] [localhost/sid#820a278] [rid#82695f0/initial] (2) forcing proxy-throughput with http://eejnet- zope2:8081/VirtualHostBase/http/139.191.42.53:lotot (not ok) 127.0.0.1 - - [26/Jan/2004:15:41:52 +0100] [localhost/sid#820a278] [rid#82695f0/initial] (1) go-ahead with proxy request proxy:http://eejnet- zope2:8081/VirtualHostBase/http/139.191.42.53:lotot [OK] rewite.log example 2 ==================== 127.0.0.1 - - [26/Jan/2004:15:41:51 +0100] [localhost/sid#820a278] [rid#82695f0/initial] (2) init rewrite engine with requested uri / (ok) 127.0.0.1 - - [26/Jan/2004:15:41:51 +0100] [localhost/sid#820a278] [rid#82695f0/initial] (3) applying pattern '/(.*)' to uri '/' (ok) 127.0.0.1 - - [26/Jan/2004:15:41:51 +0100] [localhost/sid#820a278] [rid#82695f0/initial] (2) rewrite / - > /VirtualHostBase/http/139.191.42.53:80/VirtualHostRoot/127.0.0.1 - - [26/Jan/2004:15:41:51 +0100] [localhost/sid#820a278][rid#82695f0/initial] (3) applying pattern '^/(.+)$' to uri '/VirtualHostBase/http/139.191.42.53:80/VirtualHostRoot/' (ok) 127.0.0.1 - - [26/Jan/2004:15:41:51 +0100] [localhost/sid#820a278] [rid#82695f0/initial] (5) map lookup OK: map=lb key=VirtualHostBase/http/139.191.42.53:80/VirtualHostRoot/ -> val=http://eejnet-zope1:8081/VirtualHostBase/http/139.191.42rulotot (not ok) 127.0.0.1 - - [26/Jan/2004:15:41:51 +0100] [localhost/sid#820a278] [rid#82695f0/initial] (2) rewrite /VirtualHostBase/http/139.191.42.53:80/VirtualHostRoot/ -> http://eejnet-zope1:8081/VirtualHostBase/http/139.191.42rulotot (not ok) 127.0.0.1 - - [26/Jan/2004:15:41:51 +0100] [localhost/sid#820a278] [rid#82695f0/initial] (2) forcing proxy-throughput with http://eejnet- zope1:8081/VirtualHostBase/http/139.191.42rulotot (not ok) 127.0.0.1 - - [26/Jan/2004:15:41:51 +0100] [localhost/sid#820a278] [rid#82695f0/initial] (1) go-ahead with proxy request proxy:http://eejnet- zope1:8081/VirtualHostBase/http/139.191.42rulotot [OK] --------------------------------------------------------------------- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
