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Subject DO NOT REPLY [Bug 42695] mod_proxy balancer problem
Date Tue, 13 Oct 2009 13:17:07 GMT

Ralf Kraudelt <> changed:

           What    |Removed                     |Added
             Status|RESOLVED                    |REOPENED
         Resolution|REMIND                      |

--- Comment #4 from Ralf Kraudelt <> 2009-10-13 06:17:03
UTC ---
When I move from 2.2.11 to 2.2.13 or 2.2.14, this problem occurs. When I move
back to 2.2.11, the problem disappears. Apache HTTPD runs under Windows

My configuration is:

<Proxy balancer://sbhome1>
    BalancerMember ajp://sbhome-tomcat1:8009/qisserver keepalive=On
    BalancerMember ajp://sbhome-tomcat4:8009/qisserver keepalive=On
    ProxySet lbmethod=bybusyness
ProxyPass /qisserver balancer://sbhome1 stickysession=JSESSIONID|jsessionid
nofailover=On timeout=60

The error is:
[Tue Oct 13 09:36:41 2009] [error] ajp_read_header: ajp_ilink_receive failed
[Tue Oct 13 09:36:41 2009] [error] (120006)APR does not understand this error
code: proxy: read response failed from (sbhome-tomcat4)
[Tue Oct 13 09:36:41 2009] [error] proxy: BALANCER: (balancer://sbhome1). All
workers are in error state for route (wzvx08)
[Tue Oct 13 09:36:41 2009] [error] proxy: BALANCER: (balancer://sbhome1). All
workers are in error state for route (wzvx08)

Tomcat is 6.0.18, Java is 1.5b16 on SLES10SP2 64Bit, VMWare ESX 3.5. During the
errors in Apache's error.log (1-2 minutes), our Tomcat application seems not to
respond and loses it's database connections. Our application logs show some
kind of blackout (no entries) for the time of unresponsiveness. After 1-2
minutes, Tomcat continues to work without error.

There are no messages regarding threads nor anything else in Tomcat. The error
occurs in high load (not overload) situations on both Tomcat servers.

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