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From "King Holger (CI/AFP2)" <Holger.K...@de.bosch.com>
Subject [users@httpd] "mod_proxy" | bundling | timeout | connection losts
Date Wed, 01 Dec 2010 07:12:33 GMT
Hi Apache2 professionals,

we identified the following problem when using "mod_proxy_ajp" in combination with a balancer
configuration (see detailed configuration below), that:
- multiple HTTP requests seem to use the SAME AJP "CHANNEL"
- when just ONE request is exceeding the configured "ProxySet timeout" configuration (see
detailed config below), the following error is displayed within the central Apache2 error
log (exact the time interval after the long running request):
  [Mon Nov 29 17:17:11 2010] [error] (70007)The timeout specified has expired: ajp_ilink_receive()
can't receive header
- when this log entry occurs, all connections running over the above AJP channel are cut -
including connections that do run much more shorter than the timeout interval specified. Possibly,
Apache2 assumes the Apache Tomcat instance is not reachable anymore and switches from one
to the other Tomcat server.
- all clients running over this AJP-connection are lost and loose the connection to the server

Here the long running request (duration is specified in microseconds):
10.35.32.123 - - [29/Nov/2010:17:12:11 +0100] "POST /xxx/Dispatcher HTTP/1.1" 500 538 "<request
url>" "Mozilla/4.0 (compatible; MSIE 6.0;Windows NT 5.1; SV1; .NET CLR 1.1.4322; .NET CLR
2.0.50727; .NET CLR 3.0.04506.30; .NET CLR 3.0.04506.648; .NET CLR 3.5.21022; .NET CLR3.0.4506.2152;
.NET CLR 3.5.30729)" "JSESSIONID=80AC6DFF149E802C3AA8735996CE7AA0.rb-wcmstc1; "80AC6DFF149E802C3AA8735996CE7AA0.rb-wcmstc1"
"-" 300456752

Here, the following configuration snippet - including the timeout interval:
<Proxy balancer://fs4server>
    BalancerMember ajp://rb-wcmstc1.xx.xxxxx.xxx:8009 loadfactor=100 retry=10 route=rb-wcmstc1
    BalancerMember ajp://rb-wcmstc2.xx.xxxxx.xxx:8009 loadfactor=100 retry=10 route=rb-wcmstc2

    ProxySet stickysession=JSESSIONID|jsessionid
    ProxySet lbmethod=byrequests
    ProxySet scolonpathdelim=On
    #ProxySet nofailover=On
    ProxySet timeout=90
</Proxy>

When checking the documentation for "mod_proxy", below http://httpd.apache.org/docs/current/mod/mod_proxy.html#proxypass
we identifed, there are TWO timeout settings available:
- timeout
- connectiontimeout

Our questions:
- how to prevent bundling HTTP-requests in JUST ONE AJP connection?
- how to set "timeout" and "connectiontimeout" intervals to prevent connection losts?
- are there any other possibilites to prevent that behavior?

Any suggestions are very welcome!

Best regards,
Holger King

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